Movies & More reviewer John Gillispie shares his thoughts on the movie âGreenland,â which is rated PG-13 and available on DVD. The movie âGreenlandâ looks at one familyâs efforts to survive when parts of a comet start crashing to Earth causing chaos around the globe. Movies can provide a great escape from the troubles in our own lives, yet because of the storyline for âGreenlandâ donât look for a break from stress while watching this film. Gerard Butler plays John Garrity, a father and engineer, who is selected by the government for shelter when news of the cometâs devastation breaks. Imagine the awkwardness when neighborhood guests learn via a message on the TV that John and his family have been chosen for a shelter in Greenland while they have not.