War film
Derek was borrowed by Republic Pictures for a war film, "Thunderbirds" (1952). He went back to Columbia for "Prince of Pirates" (1953), a swashbuckler for Sam Katzman; two Westerns, "Ambush at Tomahawk Gap" (1953), with John Hodiak and "The Last Posse" (1953) with Crawford. He was back with Hodiak for "Mission Over Korea" (1953), a Korean War film, then was again borrowed by Republic for "Sea of Lost Ships" (1953). In July 1953, Derek left Columbia.