The Chimp

The Chimp is the one hundred and thirty sixth episode from Season 1.

Plot
Dennis and Lars are sneaking into an ice skating show carrying ice skates, with Lars worrying they'll get into trouble. Dennis promises they won't. They sneak past a guard, who is sleeping on the job, put on their ice skates, and start skating when a man and his chimpanzee Boo Boo come out to practice. Boo Boo starts off by jumping over some barrels and twirling. When Boo Boo and his owner leave, Dennis wants to practice the trick Boo Boo did, only for Lars to have his doubts.

Dennis succeeds in jumping over the barrels, but ends up landing in the arms of Boo Boo's trainer. Dennis explains that he and Lars are leaving, only for Boo Boo's trainer to order them to come back. Upon getting off the stage, they bump into Boo Boo's trainer, proving Lars' worries correct that they'd be in big trouble. Dennis goes across the barrels, with the owner jumping into one of them. Dennis and Lars make it into Boo Boo's dressing room.

While taking his ice skates off, Dennis spots Boo Boo, who is chattering and locked in his cage. Boo Boo points to the keys and rope, and Dennis gives them to him. Boo Boo's trainer finds Dennis and Lars in the dressing room. Boo Boo uses the rope to trap his trainer to his cage, giving Dennis and Lars a chance to escape, with Boo Boo escaping too. That evening, Boo Boo is looking around for some mischief to create.

Alice is laying out the plates for dinner, and as Henry asks what's for dinner, they hear a scream. As it turns out, Boo Boo is chasing Margaret, who is frantically crying for help to get the chimp away from her. Dennis lets Margaret and Boo Boo in, only for Margaret to barge in and shield herself from Boo Boo behind the dining table. Boo Boo then dances on the dining table, and after seeing a plate shatter, Margaret gets up and runs away, begging for Dennis to help her.

Boo Boo stops chasing Margaret when he sees his trainer on TV. Boo Boo's owner is explaining that his chimp escaped and that he's the only family he has, and he'd trained Boo Boo ever since he was a baby. Boo Boo then picks up the phone, wanting Dennis to call his trainer. Later, Boo Boo returns to his trainer and kisses him, pleased that his trainer isn't mad that he'd ran away because we all do crazy things.

When the night finally arrives, Boo Boo, and his trainer, named Bob, go on the ice skating stage. Bob presents his chimpanzee Boo Boo to the audience, which include Dennis, Alice, and Henry. Boo Boo skates towards Dennis to shake his hand. Next, Boo Boo jumps over the line of barrels, and lands in Alice's lap to kiss her. Everyone erupts in laughter as Boo Boo jumps back into Bob's arms, and the spotlight shines on not just Boo Boo and Bob, but Dennis too.