Stu Pickles has planned a family cruise for the Rugrats and their parents.
But when a storm sinks their boat, they find themselves stranded on an island!
The adults think the island is uninhabited, but Tommy Pickles knows better.
He and the other babies soon find the Thornberrys, and Tommy enlists Nigel Thornberry's help to get them off the island.
But when the babies get stuck underwater in the Thornberrys' bathysphere, will they be able to work together and get out in time?
Find out in this wild, action-packed adventure!