Final boss - The Doom Wiki at

The final boss (often informally called the Icon of Sin because of the Doom II level of which it is a part) is the final boss of Doom II, in MAP30: Icon of Sin.

Icon of Sin (Doom II), Doom Wiki

Icon of Sin (Doom Eternal), Doom Wiki

VIOS, Doom Wiki

Doom (1993 video game) - Wikipedia

Doom II cast sequence, Doom Wiki

Spiderdemon - The Doom Wiki at

Mother demon - The Doom Wiki at

Cyberdemon (Doom 3), Doom Wiki

Hell guard - The Doom Wiki at

Anyone think that the big demon from the new trailer could be the

A_BrainScream - The Doom Wiki at

Icon of Sin (Doom Eternal) - The Doom Wiki at