Casey Ryback is a fictional character and action hero from the Under Siege films of the 1990s. Played by Hollywood action star Steven Seagal, Ryback is a Chief Petty Officer and former Navy SEAL operator turned chef with top training in martial arts, explosives, special-weapons and tactics. He is a master of unarmed combat, highly skilled with firearms, knives and other forms of combat which enables him to defeat mercenaries/terrorists with ease.