Futurama Episodes

Bender is declared the new Santa when it is discovered that the evil Santabot has been frozen in a block of ice on Neptune. But when Bender begins delivering toys, the citizens, who are unaware that Santa is now a good guy, stage an all-out assault against him. Just when things can’t get any worse, the evil Santa’s icy tomb thaws and he escapes to exact his wrath upon the world.
wikipedia.org summary:
A Planet Express mission to Robot Santa’s colony on Neptune leaves the murderous robot trapped in the frozen sea, and Bender takes over as Santa, vowing to bring peace and goodwill to Xmas again. But when Bender is mistaken for the real Robot Santa, he is arrested and sentenced to death.
imdb.com summary:
When Fry, Leela and Bender make a delivery to Neptune, they run afoul of the robot Santa Claus. Bender takes his place, but the previous Santa’s fearsome reputation makes his job difficult.