Alfred Hitchcock Presents S07E26 - Ten O'Clock Tiger

Boxing manager Arthur Duffy is offered a powerful drug by a shady character named Boots Murphy. Boots tells him it is a drug used on race horses to turn losers into winners. Arthur decides to use the drug on one of his washed up fighters named Soldier Fresno. After Soldier is injected with the drug, he starts to win. Arthur and Boots begin to rake in the money. Soon Soldier gets a bout with the champion. Before the fight, however, Boots tells Arthur that he only has two more doses of the drug. Determined to win the fight, Arthur injects Soldier with both doses. Unfortunately the overdose causes Soldier to believe that he is already in the ring. He springs up and starts fighting. He beats Arthur to death.