Roberto, who is on Travis’ soccer team, is really good at soccer but he won’t cooperate with the rest of the team. Towards the end of practice one day, he gets into an argument with his teammates and quits, despite the fact that the regional championships are coming up soon! The Ham-Hams know that Roberto is a kind person who truly loves soccer, and that without Roberto, Travis’ soccer team won’t have a good chance in the championships, so they decide to try to patch things up.

Laura’s grandpa, who loves to invent things, shows up at the doorstep on mile-high stilts. What other wonderful creation has he brought with him? Nothing less than an ingenious little hamster robot, named “Super Hamster Robo-Joe”!

Maria holds a birthday party and the ham-hams tag along. The ham-hams are worried that the party may be ruined when they accidentally knock down Maria's doll collection after being chased by her new puppy, Princess.

Laura gets a bad score on the math test. Afraid she won’t be able to go out with Kana, Laura lies to her Mom and says that she got a perfect score on her test. In the meantime, the Ham-Hams encounter a strange new hamster…Nin-Ham, the ninja hamster from Iga Iga Valley. In anticipation of having Nin-Ham teach them some ninja moves, the Ham-Hams prepare Nin-Ham a huge feast! Nin-Ham doesn’t want to admit that his grades were so poor that he didn’t actually pass ninja school, so he shows the Ham-Hams some pretend ninja tricks.