Arthur's First Sleepover is the first part of the last episode of Season 1 of Arthur. It day viewed on June 2, 1997 with Arthur's New Year's Eve.
Arthur has a sleepover with Buster and Brain, even with all the talk of UFOs. D.W. wants to join them so that she can take a picture of a UFO. The boys do not agree. D.W. plays a prank on the boys with fake UFOs in retaliation and vice versa.