Kid vs. Kat

'Kid vs. Kat' is a Canadian animated series, airing between 2008 to 2011, ending with two seasons and 52 episodes. Coop Burtonburger, a ten-year-old boy, finds out that a stray cat his sister brought home, Kat, is actually an evil alien who plans to take over the world. The two fight each other, with Coop trying to foil his enemy's plans while also attempting to prove to his family of their pet's true nature.

S2E2A: Flea Brained
Kat uses robotic fleas to brainwash people to do his bidding. He uses them on Coop, and has fun with this as Coop is ordered to send a running water hose into his shorts, causing them to swell up.