|Born:||millions of years ago|
He was created in response to The One's sapping of the Old Ones' primary star. The Old Ones placed Ruk on stand-by, for approximately 500,000 years, when discovered by Doctors Korby and Aaron Brown. (TNG novel: Q-Strike)
Spoiler warning: Plot and/or ending details follow.
In an alternate reality, Ruk was a member of the Imperial Elite, the super-powered enforcers of the Imperial Planets Science Police. In this reality, Ruk had been reconstructed with one-half of his body built with different technology. With his robotic brain, Ruk was able to control fellow Elite member Validus—a similar arrangement to the way an alternate Validus was enslaved by the cyborg Tharok in the reality of the Legion of Super-Heroes. When encountering Ruk, Captain James T. Kirk recognized the android after having encountered him in the primary universe.
When the Legion and a landing party from the Federation starship USS Enterprise were trapped in the Imperial Planets' timeline, Ruk and the Imperial Elite squared off against the time-travellers and were defeated. Ruk in particular was defeated when Captain Kirk tried to lunge the android, allowing himself to be grabbed into a stranglehold—much as he was in his first battle with the other Ruk—giving Cosmic Boy a chance to immobilize Ruk with magnetic power. (TOS - Legion of Super-Heroes comic: "Issue 3")