I was on Gilligan's Island. I was Gilligan, in fact. We were being stalked by a horrible sea monster but it turned out at the end to be Mrs. Howell in disguise. I am not sure what her purpose was...
On another evening, I was a Vulcan arbitrator/diplomat, smoothing out relations between Lex Luthor (who was a Klingon) and some other alien race I didn't recognize. They were disputing water rights on a desert world. The Enterprise deck was all laid out in front of me on an AutoCAD workstation at one point.