Jupiter is a character from The Twelve Tasks of Asterix.
Jupiter is seen alongside the other Olympian gods when Asterix correctly answers the Old Man of the Mountain's riddle. He rejects Minerva's suggestion to elevate Asterix and Obelix to godhood, saying that "[they] don't let all and sundry in, like a pub" (as Bacchus lies hiccuping on a cloud) and announcing that he's getting fed up with the Gauls as he hurls a handful of thunderbolts.
In the original French, he is voiced by Jean Martinelli (who also voices Julius Caesar, which interestingly mirrors Caesar's status as emperor, and his refusal to grant the Gauls godhood). In English, he is voiced by an uncredited Paul Frees.