Super Mario Bros movie novelization by Todd Strasser

Plumbers in a parallel universe!

When an evil reptilian tyrant sets out to merge his world with the human world, it's up to everyone's favorite plumbers to stop him. Mario and Luigi (better known as the Super Mario Bros.) must avoid de-evolution, battle fireball-shooting goombas, and save daisy, the beautiful paleontologist-princess—or face the end of the world as they know it!