I'll give a biography of Grock. He was zapped onto a secret military base somewhere in the interior United States in our universe from his fantasy one. There he was greeted by an entire base of military men aiming machine guns at him. When placed in a cell for observation, the military brass became convinced that he might be able to help them battle villains that were also zapped into this universe from the fantasy one.
Since going to work for the US military, Grock has decided to turn over a new leaf and become a hero. He also decided at age 257 to obtain a high school diploma, which he did.
Last night he and a bunch of other men on the base went to the cantina to celebrate. Sadly, Grock had a little too much and is now recovering with the worst hangover he has ever had in his life. His boots and loincloth are somewhere on the base and will no doubt be found at the top of a flag pole. His room is littered with beer and Champagne bottles. You get the idea.