The Helltime Hunter is the first of the three hunters and the first boss that players fight in Doom 3: Resurrection of Evil. Found towards the end of Erebus - Level 2: Erebus Dig Site, he resembles a hovering Hell Knight without legs, and can move from one part of the area to another using short bursts of incredible speed. The Helltime Hunter creates an orange sphere in front of himself and then moves extremely fast, appearing as if he "beams" from place to place; stripes will appear to announce the Hunter's direction. He attacks by throwing fireballs that do as much damage as those of an Imp, but should he get too close to the player, he can also scratch them with his large claws as well. The Helltime Hunter also has a special attack in which he hurls a swarm of several fireballs at the player all at once; this fireball swarm can be dodged by sprint-running sideways. The lower part of his body is surrounded by fireballs and seems to be burned.

After being tasked by the Maledict to hunt the Artifact, the Helltime Hunter is the first enemy who confronts the marine and is encountered in front of a hell portal near the excavations. As this Hunter appears the Maledict says that the marine has met his death, so he is quite convinced that the Hunter can cope with the soldier. In order to defeat the Helltime Hunter, the player must use the Grabber to catch the plasma balls that are launched from the Martian defense turrets and send them back to the Hunter himself. It can be difficult at times, since the Hunter can move from certain places of the area instantly. It takes about 4-5 direct plasma ball hits on the Hunter to kill him.

After the player kills the Helltime Hunter, the Artifact becomes usable, since it now has the Helltime ability. From then on, the player can use the Artifact to slow time down. It does not affect the player's movement or weapons in any way. The Helltime Hunter is the only boss who cannot be defeated by weapons other than the Grabber, even if the player uses a stronger weapon procured by using cheats.

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