Terror threat. Good evening. And its great to have you with us here on a wednesday night. And we begin with bill cosby. America has been watching his stunning fall in slow motion, and tonight, a turning point. For the first time, criminal charges for Sexual Assault. Stepping out of that suv today, his legal team holding onto each arm. As he then makes his way into a small courtroom in pennsylvania. Unsteady on his feet as he walks over the curb here, on his way into the courtroom. Going before the judge, later taken to the police department, fingerprinted and tonight, free on 1 million bail. This evening, we are learning more about the woman behind the charges, and what she says happened. And why this time, there were criminal charges. Abcs ryan smith was in the courtroom. Reporter tonight, a frail bill cosby walking into a criminal court for the first time. The once venerated comedian appearing before a pennsylnia judge to face a charge of this woman andrea constand. These charges stem from a Sexual Assault that took place on an evening in early 2004. At mr. Cosbys home in cheltenham township, montgomery county. Reporter cosby met constand through her job with the Temple University basketball team. Court documents say he gave her three blue pills he claimed were herbal, saying they would make her feel good and take the edge off, calling them Three Friends to help her relax and asked her to taste the wine. Experiencing blurred vision and difficulty speaking. Cosby, then telling her to lie down, according to the criminal complaint, and assaulted her while she remained frozen and paralyzed. Criminal chargrg were not filed at the titi. Constand later filed a civil suit against cosby. But that ended in a confidential settlement. Depositions from that case were unsealed this past july. There, cosby insists the pills encounter with constand as consensual. Still, it was those depositions that led prosecutors to now file criminal charges. Reopening this case was our duty. Reporter authorities in pennsylvania brought the felony charge today, as the 12year statute of limitations will run out next month. Lawyers for other accusers hope this will help their cases, as well. More than 50 women have accused bill cosby of Sexual Assault, drugging, or rape which he has consistently denied. This is a stunning development. Clearly now, they believe they have new evidence and new ammunition that they think can convict bill cosby. Repepter cosby was released on 1 million bail. His m shot was taken. He was fingerprinted. Had to surrender his passport and was ordered not to contact the victim. Cosbys lawyers tonight releasing a statement to abc news, saying make no mistake, we intend to mount a vigorous defense against this unjustified charge. And ryan smith is now with us live from pennsylvania. From the judge . Reporter that final message, david, good luck, sir, and cosby answered that question, thank you. His next court appearance, david, january 14th. Ryan smith leading us off tonight. Ryan, thank you. And as you heard ryan mention there, more than 50 women have now come forward, accusing bill cosby of Sexual Assault. And even though the statute of limitations has passed in many of their cases, this does open the door for something else. One attttney calling what hahaened today theest Christmas Present they ever received. Heres abcssinsey davis. Reporter tonight, a host of women who claim to have been assaulted by bill cosby, even decades ago, may suddenly feel vindicated. Now, its time for him to be sorry. Reporter it was andrea constands case that prompted 13 other women to come forward to her attorneys with their own allegations of Sexual Assault, offering to testify on her behalf. Now prosecutors could turn to those accusers to strengthen their criminal case. Prosecuted, pennsylvania law allows them to testify as witnesses in a Sexual Assault case. In a deposition for constands case, when cosby was asked if he used quaaludes to illusive con senseual sex in the past, he said yes. At this point, more than 50 women have come forward accusing cosby of Sexual Assault, druggingngr rape. Thee 78yearold has long denied the allegations. I have been in this business 52 years, and i have never seen anything like this. Reporter when the embattled comedian sat down with us back in may, he would not discuss the allegations directly. And i i cant speak. Reporter earlier this month, the man once regarded as americas favorite dad fought back, filing a countersuit against seven of his accusers against him. We are now taking steps in order to right a wrong. Reporter the statute of limitations for pressing criminal charges has expired for most of theaccusers, but several civil suits are in the seeing him criminally charged, having to face a trial, is the best Christmas Present that they have ever received. Reporter this Philadelphia Hotel is where cosby was deposed the constand case. Several of his alleged victims are saying today, they are hopeful the prosecutors can use that case to put cosby behind bars. David . Linziesey davis on this case from the start. Thank you. Now, to the weather emergency unfolding tonight, with new years eve almost here. Families trapped on top of their homes, drivers caught in their cars. 19 states now under flood watches and warnings tonight, and look at this. This is interstate 44 outside st. Louis, disappearing right there in the middle under the water. Meteorologist rob marciano with the dramatic rescues tonight, and the next system now hes watching for new years. Reporter tonight, already swollen missouri rivers still rising. News helopters catching dramatic rescues. First responders using a ladder truck to rescue this man from high water. The man on that roof with his there all night. Hundrere of homes evacuated. Federal offifials watching at least 19 major levees for possible brerehes. More than 200 state roads shut down for miles. Its pretty unreal. This is supposed to be two malor highways. Reporter interstate 44, a major artery. Carry 1ging 100,000 cars a day. Entire towns like sherman cut off. This is t first time in 77 years this has ever happened according to my grandmother. Reporter the flooding already blamed for at least 20 deaths in missouri and youll aisle alone. Most killed in their cars, driving on flooded roadways. 20,000 without water after flood waters overpowered this treatment plant. Youre going to be without water for how long . I have a 4yearold and a 6monthold baby. Going to be fun. Reporter missouris National Guard called up. Here, manning the sandbags. And rob with us now from valley park, missouri, tonight. And rob, you told me, the water is still rising tonight . Reporter yeah, and rising quickly. Its almost up to the t tffic lights. Will continue to rise and crestst later on tonight. Oneef many large rivers that feeding into the mississippi. We have the missouri, the ohio, the arkansas. All have to drain, so, were going to see Flooding Issues up and down the mississippi for the next couple weeks, david. Meantime, rob, you are tracking that rain through new years eve. And the cold temperatures on the way. Reporter yeah, the southeast has been getting hammered with heavier rain. We have flood watches and warnings there from the Florida Panhandle all the way up to virginia. So, more rain expected the next 12 hours. Tapering off tomorrow night. Rest of the country really for new years eve looks to be dry. Look at the temperatures around midnight. 40 in new york, below freezing, though, in detroit, to st. Louis, to the north and west, where it will be chilly across the intermountain west. Here in st. Louis, it will be cold, but the good news is, in rain forecast for at least the first week of the new year. That is good news. Rob marciano inn missouri for us again tonight. Rob, thank you. Now, to the breaking velopments involving the teenagerern the run, with h h mother, fofod in mexico. And tonight, word coming in now his mother, also being allowed to stay in mexico, at least for now. And the new video seen first here on abc news of ethan couch, his hair dyed black, in a local market, shortly before he and miss mother were caught. Abcs matt gutman in mexico tonight, on the call to Dominos Pizza that led authorities straight to them. Reporter tonight, another legal reprieve for ethan couch and his mother. A Mexican Court staying his deportation to face a texas judge for alleged probation violations. The teen fugitive and his mother hiring lawyers here that have managed to keep them in this Detention Center for at least another three days. They could pay them as much money as they want to, to drag this thing out as long as they want to. Reporter couchs american legal team infamously invoking an affluenza argument in his sentencing for a drunk drive, ash that killed four. Ying he was too spoioid to know rigig from wrong. It seemed to work. He not ten years probation. Couch faces four months for allegedldlviolating probation now authorities also targeting the case were filing against her for assisting him and hindering an apprehension in texas is a felony punishable by two to ten years in the penitentiary. Reporter exclusive video shows the affluent family strolling into at a low end grocer on the seedier side of puerto vallarta. The 48yearold tonya, on saturday, in that tank top, chatting with the butcher. And, theres ethan. His blond hair and goatee dyed black. Casually talking with the butcher. Paying with pesos for chicken and casually flipping his hand up to wave goodbye. Two hours later, Mexican Police would swoop in you see him handcuffed, escorted to a police cruiser. Authorities saying an order to Dominos Pizza tipped them off to their location. Were told that inmates here sleep on mats on the floor. Mexican authorities are telling us, these immigration proceedings could keep him here for weeks. David . And matt will take us inside the case. A special onehour edition of 20 20, friday night, right here, 10 00 eastern 9 00 central. In the meantime tonight, we turn to the race for 2016. Donald trump and his new assault on the clintons, saying Hillary Clinton has a major problem, adding, its right to in her own home. Trump saying former president clinton is fair game. But there are many pointing to what trump has said about that in the past. Abcs cecilia vega on the campaign, every step of the way. Reporter tonight, theres just one word to describe it. We view this as war. Dont we view this as war . Reporter in Donald Trumps direct line of fir hillary is a didister. Hillary doesnt have a clue. She has lower energy t tn jeb bush. I just have to turn off the television. So many times. She gives me a heaeache. Reporter the gop frontrunner whonce called former president bill clintons infidelity totally unimportant they tried to impeach him, which was nonsense. Reporter now hurling his harshest words yet and she wants to accuse me of things, and the husband is one world . Give me a break. Reporter this heated battle reaching fever pitch. Today, in south carolina, Trump Supporters showing up by the thousands. Last night, trump opening up his private plane, Trump Force One watching the ceiling, please. Rorter but the twice divorced billionaire opening up his own private life to scrutiny too. Are your own personal indiscretions fair game . Yes, they would be. Reporter toght, the clintons not commenting. But how far this former group of friends has fallen. Trump writing back in 2008, i know hillary, shed make a great president of vice president. But now, in n election year, this i love the concept, love, love, love having g woman president. Cant be here. Shes horrible. Shes horrible. Reporter and bill clinton hi t trail on monday. His first solo trip for his wife. Trump will be just 20 miles away on the very same date, vid. This may be just the beginning cecilia vega with us tonight. Cecilia, thank you. There is another headline were following on the campaign trail. A deadly crash involving four secret service agents, assigned to keep candidates safe. In this case, assigned to a clinton rally. Abcs linzie janis is in New Hampshire. Reporter this is whats left of the ford taurus that was carrying four secret service agents, on duty protecting Hillary Clinton. The agents, two men and women, were driving down this New Hampshire highway during a snowstorm last night, when the driver of a vehicle in the oncoming lanee crossed over double yellow lines, hitting them. This is a headon collision . Thats correct, yeah. Both vehicles collided with each other and spun off each other. Reporter all the victims, including those four agents, had to be cut out of their vehicles. The driver of the car that caused the crash, 45yearold bruce danforth, died on the scene. Police say danforth, who has driving on a suspended license. Today, hillary clip on the giving her condolences, saying shes grateful every day for the secret service. David, this is where the accident happened. Three of those agents have already beenreleased from a local hospital. One remains in a boston area hospital tonight. David . Linzie janis in New Hampshire. Thank you, linzie. Overseas tonight, belgium on alert. Threats of a possible terror attack forcing authorities to cancel new years eve fireworks in brusselsls the decision today following t t arrest of two terror suspects accused of plotting to attack police, soldiers and huge crowds celebrating the lidays. Authorities saying the plan may have been inspired by isis. Meantime, back here at home tonight, the countdow to new years eve is on. 1 Million People expected in new york citys sometimes s times square. Abcs gio benitez tonight on the unprecedented security there. Reporter with just over 24 hours until the big night, security tightening ahead of new years eve celebrations across the nation. Isis and other terror groups. In new york city, an estimated 1 million revelers expected to pack into about 20 blocks in and around times square. We are not aware of any threat at this time that we deem credible. Reporter but they arent taking any chances. The nypd deploying 6,000 heavily armed officers throughout times square, more than ever before. And the Police Presence wont just be down there in times square. The nypd will have helicopters in the air and officers on rooftops monitoring the festivities bew. About 20,000 smartphones were handed out to officers this year, so they can share information quickly about potential threats, helping keep everyone here safe. And david, with these security measures, authorities here say new york city, on new years eve, will be the safest place in the rld. David . Gio, thank you so much. And join Ryan Seacrest and the team right here on abcs beginning at 8 00 eastern 7 00 central. Ill be watching. There is still much more ahead on world news tonight. The fbi on the scene tonight of a fiery plane crash, straight into a downtown building. The husband who flew his plane into his wifes Office Building and then hitting another building, as well. Authorities on the ene. Well have much more in a moment. T headline just coming in. The passenger planene making an emergency landing, flying into heavyturbulence. Nearly two dozen hurt. And then, the showstopping moment. A famous singer, about to be honored by someone else famous. 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She was not in the building at the time. From the damage, it appears the plane flew in from the west. Hit that first building where the wife works then crashed into a second building bursting into flames. Also, nenehbors say police andnd medics were at the couples home Authorities Say no one was taken to the hospital, and no crime had been committed. An aviation investigator is quoted as saying evidence warranted bringing in the fbi, but david, no one is saying what that evidence is. All right, david kerley on the investigation tonight. David, thank you. When we come back here, word of another air scare tonight, happening just moments ago. The emergency landg. The severe turbulence. Passengers now being rushed to the hospital, as you can see. Well have much more as it comes in. And, what happened at the north pole that is now making major headlines. Well be right back. Happy birthday. I just had a heart attack. And now i have a choice. For her. For them. And him. 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The boeing 777 headed from shanghai to toronto, diverted to calgary. Temperatures at the north pole making headlines tonight. 50 degrees above normal. Closer to temperatures in southern california. Experts say this time, its due tornadoes in texas last week, now pushing warm air towards the north pole. And we can only hope, just in time for new years, the 300 million pow ererball jackpot. The thirdbiggest Powerball Jack jackpot this year. Everyone just left the studio. Wh we come back here tonight, the day mouse singer, there to honor someone se, but when she takes the stage,hy suddddly everyone was on their feet. I accept im not 22. I accept im not the rower i used to be. I even accept i have a higher risk of stroke due to afib, a type of irregular heartbeat not caused by a heart valve problem. But i wont accept is getting out there with less than my best. So if i can go for Something Better than warfarin, i will. Eliquis. 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Reporter and singing along, an overwhelmed carole king. You make me feel reporter and Aretha Franklin hadnt even started. Reporter everyone in that crowd, viola davis among them, on their feet. Thank you for watching here on a wednesday night. Im david muir. We hope to s s s you right back here tomorrow. Look at your new years forecast its time for local news that mters jenna good evening and thank you for joining us tonight im jenna rehnstrom. The rose bowl is just days away and the iowa hawkeyes are getting ready for the big game, when iowa and stanford face off on friday it will be almost like a mirror image, with the two teams being so similar. Jon schaeffer was at the Coaches Press Conference and he joins us now on board the uss iowa, actually. Jenna jon how are in california