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Maybe cybernetics wasn't such a great idea after all. Look what the demons have done with it. It seems unfair somehow you're not the only guy in Hell with a plasma gun.

-- Doom II manual
The Arachnotron monster is first introduced in Doom II in the seventh map, Dead Simple. 
 

Cyberdemon numbers by game 

Broken down by game and difficulty.

Difficulty 1: I'm Too Young To Die
Difficulty 2: Hey, Not Too Rough
Difficulty 3: Hurt Me Plenty
Difficulty 4: Ultra-Violence
Difficulty 5: Nightmare! (note: monsters respawn in this mode) 
DoomDifficulty 1, 2Difficulty 3Difficulty 4, 5
 Doom II 15 41 64
 TNT: Evilution 29 52 57
 Plutonia 68 87 94

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