Casey Ryback is a fictional character portrayed by actor Steven Seagal in the action film series, particularly known for his role in "Under Siege" (1992). Ryback is a former Navy SEAL who works as a cook on a U.S. Navy battleship. His character is skilled in combat and tactics, often using his military training to thwart threats. In "Under Siege," Ryback must confront a group of terrorists who take control of the ship. The film showcases his resourcefulness and bravery as he fights to save the crew and prevent a catastrophic event. Ryback's character became iconic in the action genre, representing the archetype of the reluctant hero.