Holt McCallany, David Costabile and Jesse L. Martin Courtesy/Peter Yang/Courtesy EXCLUSIVE: Percy Jackson and the Olympians has settled on who will be portraying the larger-than-life Titan Atlas, as well as two other notable characters set to be introduced in Season 3 of the Disney+ series. Holt McCallany has been cast in a recurring guest role as the legendary Titan, also known as the Bearer of Heaven, who was condemned by Zeus to hold up the celestial heavens after the last Titan war against the Olympians.