Batman Arkham Knight All Ending 100% Knightfall Protocol Secret Cutscene with final boss battle fight gameplay full story mode. In the explosive finale to the Arkham series, Batman faces the ultimate threat against the city he is sworn to protect. The Scarecrow returns to unite an impressive roster of supervillains, including Penguin, Two-Face, Harley Quinn, Firefly, Poison Ivy, and Riddler to destroy The Dark Knight forever. The most intriguing member of this alliance, however, is the deadly and enigmatic Arkham Knigh Joker. Subscribe now for the Latest & Hottest Games News, Game Trailers, Teaser & Games Walkthroughs..