Summary
Highlights
Johnny and Dukey are obsessed with a 3D movie about 'Purple Space Cats from Outer Space'. They combine regular 3D glasses with their sisters' new 3.5D glasses, which are designed to make any 2D image appear 3D. This results in the space cats from the movie coming to life and escaping into the real world, intent on taking over humanity.
The space cats, led by King Tummy Rub Tum Tum, immediately begin to enslave humans, forcing them to perform cat-like duties such as cleaning litter boxes. Johnny's sisters, Susan and Mary, realize their glasses are responsible and devise a plan to send the cats back into the movie. They create a special projector lens that can reverse the effect.
To get all the space cats back into the movie, Johnny and Dukey disguise themselves as purple space cats using paint guns and synthetic fur. Their mission is to lure all the cats into the movie theater while Susan and Mary prepare to use the projector lens. They are initially tasked with cleaning litter boxes but manage to convince the other cats to gather for a 'surprise' for the king.
The plan almost works, but Johnny and Dukey's disguise is discovered. Just as they are about to be attacked, Princess Whiskers, who believes humans and cats can coexist, intervenes. Johnny and Dukey then reveal Dukey as a 'purple space dog' from the movie, intimidating the cats and allowing Susan and Mary to activate the projector, sending all the space cats, including Bill Human Guy, back into the film.
In the second segment, Eugene, Johnny's rival, tries to impress Susan with a magical ring made of 'Susanite' that makes her fall in love with him. Susan immediately becomes infatuated with Eugene, and they plan a romantic cruise.
Johnny and Dukey are disgusted by Susan's sudden affection for Eugene and agree to help Mary rescue her. Mary devises a plan where Johnny and Dukey will wakeboard to Eugene's yacht, distract him, while she uses a ray to shrink his finger so the ring falls off.
The plan to get the ring fails, and it falls into the ocean. Eugene vows to retrieve it. To find the ring faster, Mary transforms Johnny and Dukey into sharks using the human-animal converter, believing they will be more effective underwater than Eugene's 'frogmen' and 'corndogs'.
As sharks, Johnny and Dukey search for the ring, encountering various marine life. They discover that everyone hates sharks, leading to a series of comedic encounters. They eventually find the former superhero known as 'Aqua Dude', who has retired and become a couch potato, and he has found the ring.
Johnny, Dukey, and Aqua Dude confront Eugene, who is also looking for the ring. A chase ensues, with Eugene attempting to get the ring back. Pinky, a female shark who is infatuated with Johnny, saves him and Dukey by distracting Eugene, allowing them to get the ring back. Susan returns to normal, and the adventure concludes with bacon for everyone.