Weasel creates an underpants time machine which I.R. steals and use to go back in time. Weasel tries to stop him and accidentally back in time too. While traveling in time, I.R. inadvertently solves some history problems.
Weasel and Baboon are a pair of friendly vampires who drink only canned blood and are just looking for a fun little night on the town in Pantsylvania. But someone should try telling that to the vampire hunter Dr. Von Smellstein, who's out to get our heroes!
I.R. takes a driving test and Weasel is his teacher! I.R. drives through the city "Miami Vice"-style and wrecks it in progress therefore failing the test! But Weasel later finds out that I.R. was coming to get a poetic license since he made a lot of rhymes during the driving test!