Catwoman Alternate Ending

In Batman Arkham City, you play as Catwoman for part of the game. The third part of her story sees her breaking into Hugo Strange's Confiscated Goods Vault. After Catwoman gas defeated the TYGER guards, she sees a screen that shows Batman under rubble after his fight with Joker in the Steel Mill during the start of Protocol 10. Selina then has a choice to make, either save the Caped Crusader or escape into Gotham with her loot.

If she goes to Gotham, the credits will start to play before Oracle calling for help, saying that Joker has won, Batman and her Father are dead and Wayne Manor is overrun. The game then rewinds itself allowing the player to make the canon choice with Catwoman saving Batman in the Steel Mill.