I.R. adopts a baby, but is soon given lessons in motherhood by Weasel. This episode had to be revised in 1999 to remove the letter “N” from I.R.’s helmet after a lawsuit from the University of Nebraska.

Both Weasel and I.R. end up in hospital after a collision course. However, a slight mix-up in the operation room leads to both having the other’s brain. This episode was originally meant to be the series finale, but the show was renewed for a second season.

Weasel and I.R. battle each other as gladiators in the Roman times.

After a chief engineer is hit by a comet, Weasel is summoned to help finish the transatlantic bridge project from New York to Paris.

I.R. manages to get himself into a live ping-pong game against Weasel, but he gets disqualified because he used an egg as a ball.

I.R. Baboon is jealous over his neighbor, Weasel, because he has a better life, job, and family (married to a beautiful Hispanic woman with half-weasel children) than him. However, when he’s invited over to Weasel’s house for a barbecue, I.R. tries to impress him with his own “family” (his pretend marriage to a pantsless woman, […]

Weasel and Baboon are cavemen living back in the prehistoric times, while Weasel tries to invent new products to create the future.

Weasel tries to settle a dispute between a group of trees and those that hurt them (notably I.R. Baboon).

Weasel and I.R. are vampires looking for some fun. What’s more, they get on well with the villagers. Later on the Red Guy (who’s a vampire hunter) tries to put steaks through their hearts.

I.R. creates a disease which transforms people into amoebas, leaving it up to Weasel to clean this mess up.

Weasel and I.R. end up stranded on an island made entirely of confectioneries (i.e., chocolate, ice cream, cupcakes, etc.).

After seeing a Monkey’s Paw sold in Chinatown, I.R. starts making wishes using the fingers of his hands.

Based on the true story of The Wright Brothers, The Red Guy narrates a documentary about The Wright Bros. and the Rong Bros. (Weasel and I.R.), competing to see who could invent the first plane.

Lance Sackless (The Red Guy) creates his own athletic games, with Weasel and I.R. as his only contestants.

Weasel and I.R. run one of the best hair salons around. However, the hair police (The Red Guy) soon has a look into this in an attempt to shut them down.

Weasel and I.R. travel to the Moon to create a new form of living, through oxygen, cities and plants.

It’s the Egyptian times, and Weasel and I.R. are both asp exterminators, attempting to save the queen Cleopantless (The Red Guy) from this infestation.

Weasel and I.R. are in search of a legend known as Big Butt, which later happens to be The Red Guy.

Weasel earns a major role for a film that I.R. was after.