Greenpeace has teamed up with Aardman Animation and celebrities including Oscar-winning actress Olivia Colman and "Stranger Things" actor David Harbour for a heartbreaking new film about a turtle family's migration.

The short depicts a family of turtles setting off on a long journey home from their grandparents' house. It starts out just like a human family on a car ride, with the kids bickering over games and videos in the back seat and the parents getting frustrated over traffic and roadworks. However things take a darker turn as they're delayed by oil drilling and are splattered with plastic junk. When they eventually reach their home, it's far too quiet—and the film ends tragically with the turtle mom, voiced by Colman, killed by the destruction of their home.

The spot ends with the stark message that "six out of seven sea turtle species are threatened with extinction." It encourages viewers to sign a petition for a U.N. Global Ocean Treaty to protect the world's oceans. 

As well as Colman and Harbour, the ad features the voices of Helen Mirren and Jim Carter of "Downton Abbey" as the grandparents.