The rest of the new enemies introduced in Doom 2 served this purpose in general the original Doom bestiary had a glaring flaw in that other than the Cyberdemon, all its enemies attacked by throwing/spitting a single basic fireball, by melee, or by hitscan.'Level 28: The Spirit World' finally has two of them, who can easily be fooled into fighting each other, as well as another big swarm of Arachnotrons nearby that can dispatch them. '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.

The Spider Mastermind was considered to be a terrible final boss in the first game due to being a step down in every way from the Cyberdemon that capped off the second episode, and in general is considered a poorly designed enemy that's very difficult to use effectively in a serious and fair manner, so the creators didn't hold back at making fun of her in Doom II, using her mainly as a Joke Character.

Doom 2 free episode one