The imp is featured in Doom 64, first appearing in MAP01: Staging Area, though with a sleeker appearance, only having noticeable spikes along its back. These Imps do not have mouths like their classic counterparts. The back of their heads comes to a point.
A more powerful variant known as the Nightmare Imp is also one of the new monsters in the game.
This version of the Imp also features discrete animations for melee attacks versus ranged attacks, similar to the Revenant in other games. This means that unlike other versions of the game, the Imp will not throw a fireball if his melee attack misses the player (since in other versions, the attack type - fireball or melee - is determined by the victim's proximity at the end of the attack animation).