Old Grandpa mouse tells to his grandchildren the "real" story of the Titanic disaster, including evil sharks, a giant octopus, and an evil whaling scheme.

Tentacolino, or "In Search for the Titanic" tells the story of the familiar characters Juan and Elizabeth, along with their mice friends Top Connors and Ronnie and their bring-along-dog Smile. After the five end up in a submarine accident, they’re taken to the wonderful lost city of Atlantis. There they discover a rebellion of rats who want to break free from the city and take over the world.