After watching a movie, Robotboy rushes to Tokyo to save it, wreaking needless havoc. Tommy has to convince Robotboy that monsters don't exist, right before Gus wakes an underground monster with his sumo wrestle stomp.
Robotboy believes that a waitress at a diner is his mother. She goes along with it because he can help her steal money. Tommy has to step in but Robotboy has to choose between his mother or his best friend.
The annual soapbox derby is coming up, and Tommy, Gus and Lola each build a car to compete. Kurt enters the race too, with an armed car used to attack Tommy. When things are looking bad for Tommy, a mysterious racer...
Moshimo sends Tommy, Gus, and Lola rings that always tell them where they are. Constantine kidnaps Lola so Tommy and Robotboy follow to save her. They're subsequently captured and it's up to Gus to save the day!
Robotboy has become too aggressive, so Tommy removes a part that turns him placid and friendly. This makes for an easy capture for Kamikazi, but a non-fighting Robotboy isn't ideal for world domination. Can he be fixed?
Gus takes a chemical additive designed for Robotboy and uses it as an energy drink, which has the side effect of turning people into monsters. A wrestling impresario offers Gus $1 million for it but Gus can't provide it...
Kamikazi disguises himself as Moshimo and requests Tommy to send back Robotboy. Tommy reluctantly agrees, but soon realizes he was duped. He and the real Moshimo go to rescue Robotboy. Robotboy must now decide...
Tommy has to go to kindergarten to be a "book-buddy", which Kamikazi jumps on. He clones the girl who is Tommy's book-buddy in order to steal Robotboy. Tommy tries to save Robotoy, but the class is soon filled with clones!
Kamikazi releases images of Robotboy to the press so the government will seize Robotoby from Tommy. Robotboy is taken and put in a secret building. Kamikazi hopes to easily steal Robotboy from the government and Tommy...
Robotboy drops Tommy, Gus and Lola in the woods during a battle with Kamikazi. Gus thinks he's a natural outdoorsman when Robotboy needs to recharge and they can't leave. Kamikazi also ends up in the woods but is on the...
Constantine attempts to blast Tommy with an "Aging Ray" designed to make him grow up and lose interest in his Robot toy. He instead blasts everyone but Tommy. As everyone ages to the end, Tommy must find an antidote.