He is sometimes depicted as one of a group of Atomic Knights, which first appeared in Strange Adventures #117 (June 1960) and ran quarterly in that monthly comic up through #160 (January 1964).

[1] Sergeant Gardner Grayle was portrayed by Boone Platt in the live action Arrowverse series Black Lightning in the third season.

"[2] The Atomic Knights appeared in every third issue of Strange Adventures in the early 1960s, beginning with #117 (June 1960) and running through #160 (January 1964).

[3] In all there were 15 early-1960s Atomic Knights stories created by writer John Broome and artist Murphy Anderson; they were a band of heroes living in and protecting the post-apocalyptic future of 1992.

Following the catastrophic Hydrogen War of 1986, a petty tyrant named the Black Baron ruled a small section of the Midwestern United States with an iron fist.

[4] The other Knights were twins Wayne and Hollis Hobard, Bryndon Smith, the last scientist left on Earth, and brother and sister Douglas and Marene Herald.

[5] The 15 Atomic Knights stories in Strange Adventures took place in "real time" (three months usually passed between the events of each story as well as in the real world) and generally dealt with post-holocaust recovery, as the Knights would fend off menaces and attempt to rebuild the area around their home base of Durvale, though they also managed to travel to Los Angeles, Detroit, New Orleans, New York, and Washington, D.C.

He then participated in Crisis on Infinite Earths as one of the Forgotten Heroes who contacted Darkseid to enlist his help against the Anti-Monitor.

Gardner Grayle wears a suit of armor that grants him enhanced strength, speed, endurance and blasts of energy, as well as being adaptable to other technology.