Two surfing lovers, whose doomed relationship is nearing to a close, find themselves swept into a time-travelling tidal wave that transports them to the 60s, where they find themselves during filming of a beach musical movie.
A sassy teen named Skylar is not scared of anything. But, she finds out that her parents are monster hunters and they are captured by the monsters. It's up to Skylar to rescue her parents and capture all the monsters.
Manny, Sid, and Diego discover that the ice age is coming to an end, and join everybody for a journey to higher ground. On the trip, they discover that Manny, in fact, is not the last of the woolly mammoths.