O'Neil was a Human male who served in Starfleet in the 23rd century. By the 2260s, O'Neil had earned the rank of lieutenant and was stationed aboard the USS Enterprise, under the command of Captain James T. Kirk.
In 2267, O'Neil accompanied Hikaru Sulu's landing party to the surface of Beta III to investigate the disappearance of the USS Archon a century earlier. Soon after beaming down, the party found themselves being pursued by the lawgivers, who enforced the will of Landru.
Although, the rest of the landing party were beamed back to the ship, O'Neil fled and he was eventually caught and "absorbed" by the lawgivers. Thankfully, O'Neil was eventually returned to normal when a second landing party, led by Captain James T. Kirk, was able to destroy Landru. (TOS episode: "The Return of the Archons")
In 2268, O'Neil served as the transporter officer on duty when the landing party beamed over to the USS Defiant. During the subsequent attack by the Tholians, O'Neil attempted to repair the transporter, but needed Montgomery Scott's assistance. (TOS episode: "The Tholian Web")
After the Battle of the Flood-controlled Shield World, O'Neil suggested that all infected corpses should be burned, which didn't go down too well with the rest of the crew. Despite this, the corpses were burned. O'Neil made note of this in his log. O'Neil and other medical officials mistook the Flood infection as a virus, and not a parasitic lifeform.
Denny O'Neil was an editor for Marvel Comics. See also, Denny O'Neil at the DC Database Project.
|Ensign O'Neil in 2157|