Batman Arkham Origins - Cold Cold Heart DLC Mark Hamill Joker and Killer Croc Easter Egg!
http://www.youtube.com/watch?v=oQo2hWHUrRM
Batman: Arkham Origins Cold, Cold Heart LexCorp Easter Egg
http://www.youtube.com/watch?v=spvwgd6LwtU
Batman: Arkham Origins Cold, Cold Heart Poison Ivy Easter Egg!
http://www.youtube.com/watch?v=MaBMSulIn3U
Batman Arkham Origins - Cold Cold Heart DLC Green Arrow, Lex Luthor and Steel Easter Egg!
http://www.youtube.com/watch?v=zhT38DMTwC4