[1] Immortus debuted in My Greatest Adventure #80 alongside the Doom Patrol, and was created by Arnold Drake, Bob Haney, Bruno Premiani, and Murray Boltinoff.

[3] At some points, it has even been implied that Immortus' origins lie in ancient history, having claimed on at least one occasion to have been alive at "the Dawn of Man".

After losing the formula needed to produce the potion, Immortus establishes a syndicate to procure artifacts and sustain his life.

[6][7][8] In the Dawn of DC series Unstoppable Doom Patrol, Immortus fuses with the Candlemaker and becomes the Eternal Flame before Quiz transports him to the Bleed, the space between realities.

General Immortus appears as a character summon in Scribblenauts Unmasked: A DC Comics Adventure.