Animorphism: The con artist working with the Devil finds out the consequences of failing him are very severe: He turns him into a mouse ... and there is a hungry cat nearby. Meow!
Halloween Episode: Although not specifically celebrating Halloween, the episode does have supernatural themes and a late-October feel, and as such stations often air this (and the later "I Was a Middle-Aged Werewolf") on or near October 31.
Out-Gambitted: Jonathan, it appears, has made a deal with the Devil to save Mark's soul ... or has he?