[1] Green Lantern Hal Jordan creates a duplicate power ring for his friend Thomas Kalmaku to wield while he is away fighting Hammond.

He escapes from prison and exposes himself to the meteorite, gaining a massive brain, psionic powers, and immortality.

[1][4] In Justice League of America #203 - #205 (June - August 1982), Hammond forms the second incarnation of the second Royal Flush Gang before Martin Stein subdues him on the astral plane.

[5] In addition to battling Hal Jordan, Hammond has also fought Green Lanterns Alan Scott[6] and Kyle Rayner.

[1] The Kroloteans, aliens who sent the meteor that gave him his powers, capture and experiment on Hammond, causing him to regain physical speech.

[8][9][10] Hammond appears in Infinite Crisis as a member of Alexander Luthor Jr.'s Secret Society of Super Villains.

[15][16][17][18] Ophidian ultimately separates from Hammond and works with Krona and the other emotional entities to attack Oa.

He attempts to commit suicide by making Superman shoot him with his heat vision, but Hal intervenes, rendering Hammond comatose instead.

During the battle between the Green Lantern Corps and the Darkstars, Hammond disrupts the Controllers' psionic powers, disabling their army.