'Level 23: Barrels of Fun' has one in a monster closet but is flanked with Arachnotrons, faring little better since the latter can in-fight with 'mama' and even win with their superior numbers if enough gang up on her at once. 'Level 20: Gotcha!''s major setpiece is a duel between a Spider Mastermind and a Cyberdemon, which the Cyberdemon wins almost every time without interference, and even if the Mastermind does win, it'll be near death and a non-threat anyway. Its first appearance on Ultra-Violence and Nightmare difficulty is as the punchline of 'Level 6: The Crusher', where you flip a switch and the crusher in question effortlessly crushes the Mastermind to death.
