One of the most successful game franchises of all time – if not the most successful franchise – Donkey Kong originally started life as a Popeye game. Nintendo didn’t have the rights to Popeye, so they altered the characters into more original ones – although as the obviously King Kong inspired name of the game suggests, not that original. Still, it’s a good thing for them they did.
The Donkey Kong franchise has done very well itself, but Donkey Kong was also the origin of Mario, who would go on to become Nintendo’s flagship character and a highly successful game franchise in his own right. To date, across assorted media, there are more than 20 Donkey Kong games (depending on how one counts different versions of the same game), and another 30+ Mario games. It’s hard to imagine that a Popeye franchise would have been that popular.