Original Airdate: November 25, 1989
Mr. Mxyzptlk, the mischievous imp from another dimension, arrives back in town – a sure sign of trouble for Superboy. While Clark, Lana, and Andy are at the pool Mxyzptlk shows up, as does a giant by the name of Vikabok, who is pursuing the impish prankster. They both disappear, and begin causing havoc all over town as the giant pursues Mxyzptlk. Superboy finally catches up with the magical being, who explains that Vikabok is upset with him because of a practical joke: he took everything the giant owned and stranded him on a desert island for 103 years. Superboy agrees to help Mxyzptlk before the whole town is destroyed, but the imp explains their only hope is for Lana and Superboy to pretend to be married, and adopt him so he can be a denizen of their world. According to Mr. Mxyzptlk, Vikabok will quit trying to kill him once he believes Mr. Mxyzptlk has become a citizen of Earth.
Guest cast: Michael J. Pollard as Mr. Mxyzptlk, Richard Kiel [Moonraker] as Vikabok.