Couldn't find a thread for it. Batman Arkham Origins, as the name suggests, is a prequel to Batman Arkham Asylum/City, that came out October 25, 2013 on XBox 360, PS3, PC, & Wii U with a spinoff version on 3DS & PSVita called Batman Arkham Origins Blackgate. I got the Wii U version as I had no interest in the multiplayer component (and an inability to use it due to having dial-up internet at home) that is included in the 360, PS3 & PC versions.
Some basic plot: Bruce Wayne has returned to Gotham City 2 years prior and coincidentally the vigilante Batman appeared around the same time. Gotham Crime Boss Roman "Black Mask" Sionis has broken into Blackgate Prison on Christmas Eve and Batman, of course, goes to stop whatever he's up to. While there, Batman encounters and defeats Waylon "Killer Croc" Jones. After this, Batman learns that Killer Croc is but one of eight assassins hired to kill Batman before the night is over for the prize of FIFTY MILLION DOLLARS to the one who kills him.
The assassins are as follows:
Waylon "Killer Croc" Jones
Slade "Deathstroke" Wilson
Floyd "Deadshot" Lawton
Garfield "Firefly" Lynns
Lester " The Electrocutioner" Buchinsky
Shiva
Bane
Copperhead