Squeeze was the first X-Files episode I ever saw and I was immediately hooked in the show. It scared the hell out of me but for some strange reason I couldn't change the channel. Needless to say that I didn't miss an episode since then. Eugene Tooms is one of the creepiest and scariest creatures/villains in The X-Files universe. He has the ability to squeeze into the smallest of spaces and he appears every thirty years to feed on human livers in order to survive for eternity. The episode is very well-written and directed, the actor who plays Tooms is absolutely amazing and Mulder and Scully's dynamic is strong even this early on the series.
Squeeze is the perfect episode to get someone introduced to the beautiful world of The X-Files beside the Pilot. It captures the magic of the show perfectly.