"Blood Feud" is the twenty-second and final episode of the second season of the American animated television series The Simpsons. It originally aired on the Fox network in the United States on July 11, 1991. In the episode, Mr. Burns falls ill and desperately needs a blood transfusion. Homer discovers Bart has Burns' rare blood type and urges him to donate, thinking the Simpsons will be handsomely rewarded. After receiving the blood transfusion, Burns sends them a card with no money. Marge convinces Homer not to send an insulting reply to his boss, but when Bart mails the letter anyway, Burns is livid. He later forgives Homer and sends the Simpsons a giant Olmec carving to show his gratitude.