Penn, Boone, and Sashi are zapped into an underwater world to save a society of fish people, but their mission gets complicated when Penn finds out that Boone is afraid of water.

When Penn and his team are zapped into an old west cowboy world where the cowboys ride dinosaurs, the town sheriff joins them on their mission to prove he still has what it takes.

After Penn and his team are zapped into a desert world filled with flying carpets, Penn begins to question Boone's abilities as the team's part time wise man.

Penn and his friends merge as giant metamorphosing robots to fight for control of an alien planet.

Penn, Sashi, and Boone must travel to the three most dangerous places in the multiverse in order to free Penn's parents as Rippen plans to conquer the Most Dangerous World Imaginable with Larry and those with him after having to close its portal from the other side.