The Simpsons Episode 8.10 The Springfield Files

Leonard Nimoy presents the strange tale of Homer Simpson's close encounter with an extraterrestrial being. One night after drinking a few too many at Moe's, Homer sees a bald, glowing, big-eyed creature that tells him not to be afraid. Homer tells everyone that the creature is an alien. Marge and the kids tell Homer that he was drinking too much and that there was no alien. A story in the Springfield Shopper about Homer's close encounter brings FBI agents Fox Mulder and Dana Scully to Springfield to investigate. After some routine tests, the agents come up with nothing and leave empty-handed. It's up to Homer and Bart to find proof of the alien's presence themselves. Armed with video footage, Bart and Homer convince the entire town that there is an alien among them. But when everybody turns out to see it, Smithers reveals that the glowing creature is actually Mr. Burns, who is undergoing a series of experimental life-extending medical treatments.