Gilligan's Planet
Too Many Gilligans (1x8)
:
Gilligan and Skipper find a cloning device that Gilligan accidentally walks through twice, and Mr. Howell and Ginger go through once, creating multiple copies of themselves with disastrous results. Eventually Bumper coaxes them all to run through the device multiple times until it short circuits and explodes, causing all the clones to vanish.