Some years later,[1] he was retconned to be a member of the Eternals, a race in the Marvel Universe created by Jack Kirby, separately based on Greek mythology.

A'lars was the second son of Kronos and Daina, two of the first generation of The Eternals, and was born eons ago in the city of Titanos.

Their father, Kronos, who was on the winning side of the civil war, toiled away in his laboratory attempting to discover the secrets of the self-regenerating cosmic life force that he felt his race was capable of attaining.

A force field cylinder containing cosmic energy exploded, disintegrating Kronos' body and imparted immortality to all nearby Eternals.

[2] He settled on Saturn's moon Titan, taking over as leader of the underground colony that his uncle Uranos had built centuries earlier.

As ruler of Titan, Mentor has access to and full use of a wide range of advanced technology located on that artificial moon.

[citation needed] Mentor appears in the Silver Surfer episode "Learning Curve", voiced by Cedric Smith.