He has a bionic arm.

Dr. Cedric Rawlings demonstrates to Major Uberhart the power of his shrinking ray on plastic replicas of Captain America and Bucky. Celia tries to convince her brother Cedric not to betray his country by joining forces with the Red Skull, but he responds by blaming her for an accident that caused him the loss of his right hand. After his men have captured Bucky, Rawlings expects that Captain America will come to his rescue, so he convinces Uberhart to wait before killing the boy. When Captain America arrives, Celia warns him of a trap, but the hero is subdued by sleeping gas. Despite Rawlings' original plan, Major Uberhart decides to send the traitor Celia with the American heroes on a ride inside a missile scheduled to blow up London. But Captain America and Bucky wake up and strike back at the Nazis. After the Nazis shot his sister dead, Dr. Rawlings decides to help the Americans and destroys his castle in the process.