The first six Nickelodeon episodes are the best. I can still laugh at
Space Madness quite a bit.
"You coveteth my ice cream bar!"
Hopefully you have a close friend who has these on tape and will let you borrow them. Actually, they're probably bootlegged on the Internet anyway. Whatever.
Trivia Fact: Billy West originally played the voice of Stimpy, then Ren as well when John K. was booted, and now has a new life as Fry, Professor Farnsworth et. al. on Futurama