The Spiderdemon, also known as the Spider Mastermind, as named in Doom II's and Depths of Doom Trilogy's manual, is the final boss of Doom, and appears again in the final episode of The Ultimate Doom, Thy Flesh Consumed.
"You guess the Arachnotrons had to come from somewhere. Hi, mom. She doesn't have a plasma gun, so thank heaven for small favors. Instead, she has a super-chaingun. Crap"
Powers and Stats
Name: Spider Mastermind
Attack Potency: City Block level (Consistently portrayed as one of the most powerful demons in the series. Is the only enemy from the original games who is capable of killing the Cyberdemon on its own. Can easily kill Doomguy regardless of amps, and is capable of harming the Doom Slayer)
Lifting Strength: Likely Class 25 (Should not be overwhelmingly weaker than the Cyberdemon)
Striking Strength: Likely City Block Class
Durability: City Block level (Able to withstand hits from the Cyberdemon. Can take blasts from the BFG9000, but early incarnations are left severely weakened as a result, and it is incapable of surviving a fully-charged shot at point-blank range.)
Stamina: Extremely high. (Comparable to the Cyberdemon)
Range: Extended melee range physically. Several feet with explosives, electricity and telekinesis. Hundreds of yards with its chaingun, and is likely capable of engaging enemies at similar distances with its other ranged weapons.
Standard Equipment: 'Super-Chaingun' (original incarnation only), plasma turret, spiked explosives, numerous energy lasers.
Intelligence: Above average (Led the invasions of both Earth and Mars at the same time. Cut off any communications between Earth and Mars before the UAC could realize what was going on)
Weaknesses: Vastly prefers ranged combat due to its sub-par melee capabilities. Its face and brain are more vulnerable to damage than the rest of its body.