Geronimo's troublemaker cousin is trapped in Transratania! And before he can even squeak, his sister, Thea, drags him along on her rescue mission. Little do they know that Transratania is the lad of vampire bats! Holey cheese, bats give Geronimo mouse bumps! Why? Well, there's nothing a bat likes more than sinking its teeth into a nice, juicy mouse.