Its true. All of it. But first, the nightline five. Theres something out there. Its a high youly contagious disease. It can be especially serious, even fatal to infants. Unfortunately many people who spread it may not know they have it. Its called whooping cough, and the cdc recommends everyone, including those around babies, make sure their whooping cough vaccination is up to date. Understand the danger your new grandchild faces. Talk to your doctor or pharmacist about you and your family getting a whooping cough fashion nation today. Seconds. Donald trump rolled in to vegas tonight with the most to lose. The clear republican frontrunner knew he had a target on his back heading into but he was not the only one who took fire. Heres abcs david wright. Reporter the Las Vegas Strip hosts plenty of prize fights but tonight at the venetian this one was big even by vegas standards. And bloody, even if most of the prize fighters wore dark suits, red tie, and a flag pin. Am i talking or are you talking, jeb . Im talking. Youre not talking. You interrupted me. Reporter tonight jeb bush showed up for the fight, landing some punches on frontrunner donald trump. Donald, youre not going to be able to insult your way to the presidency. Thats not going to happen. I do have the strength. [ applause ] leadership leadership is not not leadership is not about attacking people and disparaging people. Leadership is about creating a the threat of our time. With jebs attitude we will never be great again. That, i can tell you. We will never be great again. Reporter this was the last gop debate of 2015. The first run, since the terror attacks in paris and san bernardino, also the first gop debate since donald trump vowed this for a total and complete shutdown of muslims entering the United States until our countrys representatives can figure out what the hell is going on. Reporter tonight as expected Border Security is national security. And we will not be admitting jihadists as refugees. Reporter terrorism and trump were both center stage. Donald, you know, is great at the one liners. But hes a chaos candidate. He would be a chaos president. Jeb doesnt really believe im unhinged. He said that very simply because he has failed in this campaign. Reporter bush wasnt the only one gunning for him. Rand paul took some shots, too. The question is, how do we peep america safe from terrorism . Trump says we ought to close that internet thing. The question really is, what does he mean by that . Like they do in north korea . Reporter trumps reaction to all of these attacks spoke volumes. At one point trump actually blamed cnn for egging bush on. I think its very sad that cnn leads. Jeb bush, governor bush, down a road by starting off virtually all of the questions, mr. Trump this, i think its very sad. If you think this is tough and youre not being treated fairly, imagine what its going to be like dealing with putin or dealing with president xi or the islamic terrorism that exists. This is a tough business run for president. Youre a tough guy, jeb. We need to have a leader. Youre never going to be president of the United States im at 42 and youre at 3 . So far im doing better. I was surprised at his aggressive attitude toward donald trump. I thought it important he be more awe gresive and assertive but i thought he would have aimed at others. Reporter dr. Ben carson treated like a frontrunner last time around, this time he struggled to get a word . Some people say youre weak because youre not loud and youre not rude, but the fact of the matter is, look and see what ive done, and that speaks volumes about strength. I think that probably the thing that came out of this was a continual slide of ben carson who led at one point in time and afterward the tragic events in france when people started focusing more on these issues related to security he started falling. I think the course of this debate that fall continues. And my expectation is ben carson will be in seventh or eighth place by the next couple of weeks. Reporter the ratings of prime time tv shows and sporting events. I think weve run out of red ties in the las vegas area. Reporter tonight in queens the qed cafe had it on big screens. Think about what you did, marco. Reporter comedians and commentators weighing in in realtime on the action. Jeb start looking like when george won the presidency and he realized he was never going to be as good . Its almost like watching wwe at this point. I think thats the appeal of donald trump, is that its like watching macho man randy savage with, you know, even worse hair. Reporter throughout the campaign trumps fiery rhetoric hasnt exactly hurt him. Quite the contrary. But senator ted cruz has been gaining ground, several recent polls show him slightly ahead of trump in iowa. Until now the two have mostly abided by a mutual nonaggression pact. You better not attack. Studiously avoided a full frontal attack on trumps proposal to ban muslims from the u. S. Everyone understands why donald has suggested what he has. Reporter though he did distance himself from it. There are millions of peaceful muslims across the world and countries like india. Its not a war on a faith. Its a war on a political and theocratic ideology that seeks to murder us. Reporter the turmoil up top has left the rest of the field to jockey into position themselves as the reasonable alternative. Tonight senator marco rubio tangled with ted cruz over immigration. Does ted cruz rule out ever legalizing people that are in this country illegally now . Senator cruz . Do you rule it out . I have never supported legalization and i do not intend to support legalization. Reporter their conflict sounding at times like a Vice President ial debate, auditioning for the second spot on trumps ticket. We will build a wall that works, and ill get donald trump ill build it. Reporter governor Chris Christie painted himself as a seasoned executive but he may not have helped himself with women voters with an analysis of todays terror scare in l. A. That sounded straight out of father knows best. Think about the mothers who will take those children tomorrow morning to the bus stop wondering whether their children will arrive back on that bus safe and sound. Think about the fathers of los angeles who tomorrow will head off to work and wonder about the safety of their wives and their children. Reporter does any of this have the potential to change the race . I think donald trump comes away as still the leader. And i think ted cruz and marco rubio are the people closest at his heels. I think jeb bush tried in his way to be aggressive tonight but i think its probably too little too late. Reporter voters at the qed Screening Party tonight arent sold. I really couldnt pick a winner. Lost me halfway through. Reporter as of tonight, go until the iowa caucuses. Soon enough that voters there will have their say. Im david wright for nightline in new york. Next, dont be fooled by the frown. This cat is rich. How pets are big business on the internet. And behind the scenes of star wars, the force awakens. The painstaking work of creating the next generation of storm troopers and droids. I took mucinex dm for my phlegmy cough. Yeah. But what about mike . He has that dry scratchy thing going on. Guess what . It works on his cough too. Cough guess what . It works on his cough too. What . Stop dont pull me spoiler alert she doesnt make it only mucinex dm relieves bothwet and dry coughs for 12 hours with two medicines in one pill. Start the relief. Ditch the misery. 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They went that way that way, they went that way i cant believe that worked of course it worked beep, beep, beep i post pictures of my cats all the time on the internet and apparently if youre smart about it you can turn your cat or dog into a cash cow. Heres abc for a special series social stars. So cute. Dont be grumpy anymore. Youre super cute. Aw. Reporter its her frown that has many cracking a smile. Grumpy cat. I love a good photo shoot, especially with such a famous star. Reporter shes known as grumpy cat. But her real name is tarter sauce. Nice. Reporter and its her signature frown that went viral three years ago and helped create whats now a booming grumpy cat industry. There was a swarm of people around grumpy within seconds of you taking her out of the bag. She handles all this fame so well. Shes a diva. She was born star. Is grumpy cats human. Ive definitely been happy doing it the last couple of years. Reporter in the last two years over 250,000 grumpy cat calendars have been sold. Her book has been translated into 15 languages. The grumpy plush dolls so far, 1. 5 million sold. She even has a leading role in her very own lifetime movie. Are you serious . Im serious. Look at my face. I think sometimes humans tend to shun people that dont always look the same. Honestly, i think youre right. Like grumpy cat kind of makes being different okay. Reporter and advertisers are taking notice, signing the viral kitty to mega deals. From fridays i cans grumpy cat could not care less. Reporter to cheerios not even a smile . Uh. Never thought i would be manl managing a business around a cat. Its definitely fun and interesting. Reporter thats brian, tabithas brother. Hes the man responsible for taking and uploading the photo that shot grumpy cat into the spotlight in 2012. That same photo, a mean sensation, shared thousands of times around the web, brian is now grumpys business manager. I used to work for the Cable Company and i left that about a year and a half, two years ago. And this is my fulltime gig now. Fulltime grumpy cat. Definitely. Reporter a petite four pounds three ounces but its not just her underbite that causes that iconic frown. Its a unique genetic position. Tell me about this disorder. Feline dwarfism, its genetic. Its basically like human dwarfism. It just makes them little. Reporter these days pets are they even have their own version of the oscars, the golden collar awards. Thank you so much. Reporter which is awarded alist pets like uggy, star of the artist, and cant turn the channel without running into these small yet huge celebrities, taco bell, target, even budweiser. But in the dogeatdog world of entertainment, social media is making it easier for pets to become instant celebrities. For example, cloe, the mini frenchy who was discovered on instagram. Her posts tend to make people smile and laugh and feel good. And i think translating that to a Marketing Initiative and a partnership with a brand is so powerful. They want their ads to have that same effect. Reporter thats cloes owner. I think six months. It really started taking off and getting brand requests every week, everything from vogue to work with her that it became a little more serious. I set up an llc for her and now she has her own company. Reporter the more influence they have online the more money they can make. It can be anywhere from a couple hundred dollars to a post to 30,000 for a post. Its a wide range. Reporter the demand has grown so much that come january she will be fully dedicated to managing a pet model agency. It takes a lot of time. Thats definitely one thing i think people may not realize. Bringing her to all of these events and appearances and photo shoots. And so you need to have time to do it. Reporter s a for tips that can make your pets the next internet sensation think the content people want to share. If something makes you laugh, makes you smile, you want to share it with everyone. Oh, my god, look what i saw. So content that does that, i think, is the trick. Reporter theres no denying that these pets and their owners are making a living. How much exactly . It has to be really unique for your family because now this is like your fulltime job. Its your brothers fulltime job. Yeah. This is how youre making a living now. Yeah. Its really awesome. Ill say maybe grumpy cat brings home the cat treats. Yeah. And shes definitely priceless. Lives pretty comfortable. Otherwise, we dont talk money too much. Reporter one thing for certain, this feline phenomenon is far from over. Do you have the energy to do this for the next 14 years perhaps . I hope so. I have a daughter, so shes going to keep me going if not grumpy. Reporter after all, nothing says youve made it in hollywood like your very own replica at madam madam madam madam. For the record i did meet once meet grumpia cat. This is you us on the set of gma. I can tell you that she is nicer up next here on nightline, star wars the force awakens, why they thought he would make the perfect villain and why the whole cast and crew is talking about harrison fords dance moves. dramatic music centrum brings us the biggest news in multivitamin history. A moment when something so familiar becomes something so new. impact on metal introducing new centrum vitamints. A multivitamin that contains a full spectrum of essential nutrients you enjoy like a mint. New centrum vitamints. Go to centrum. Com for a 4 coupon. Innovative sonicare technology with up to 27 more brush movements versus oral b. Get healthier gums in 2 weeks guaranteed. Innovation and you. Philips sonicare save when you buy the most loved you get used to sweaty odors in your car you think it smells fine, but your passengers smell this. 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It ends up being a story of adventure and loyalty and shock and surprise and uses this amazing and precious thing called the force to tells us how were all connected. Reporter so much of it the work of producer Kathleen Kennedy and director cowriter j. J. Abrams, all of it inspired by star wars creator george lucas. There isnt a day that goes by or went by that we were making the movie that we dont talk about george. You know, it is its the standard what would george do. The thing that is most remarkable is that george got everything right. Reporter vet an of alias, lost, Mission Impossible 3 and the star trek series and now 49yearold abrams was brought on the star wars for decades top producer on Steven Spielbergs acclaimed films. I did pose this provocative idea of who is Luke Skywalker that that would be something that was said by one of our characters. Why was who is Luke Skywalker such a fascinateing question . I guess because it spoke to a new generation. It was that idea that there would be young people for whom Luke Skywalker was essentially a myth. Reporter in crafting and setting thes for awaken, abrams wanted the characters young, even bad guys like ky. Hes like, adam driver, really . Mike drop. One of the things that we talked about very early on was that the villain in the movie be young. Hes in the midst offed a less 70 angst. Thats new because theres a lot of male pattern baldness in the villains in Previous Star wars. You were right about me