In Mortal Kombat 9 (2011 version) for the PS3 and Xbox 360, each character has multiple fatalities that they can perform at the end of the match if your opponent is defeated.
This is the list of fatalities, and the babality and stage fatality for Johnny Cage.
All of these moves can be unlocked and added to your moves list by performing them in either Arcade Mode or Versus Mode.
Looking for more finishing moves? Check out my complete fatality guides:
Fatalities and babalities for Mortal Kombat on PS3
Fatalities and babalities for Mortal Kombat on Xbox 360
Johnny Cage’s Fatalities & Finishing Moves
Xbox 360
And The Winner Is!… — Down, Forward, Down, Forward, B while in sweeping distance
Heads Up! — Forward, Forward, Back, Down, A when close to your opponent
Babality — Forward, Back, Forward, B in jumping distance
Stage Fatality — Down, Back, Forward, RT at close range
PS3
And The Winner Is!… — Down, Forward, Down, Forward, Circle while in sweeping distance
Heads Up! — Forward, Forward, Back, Down, X when close to your opponent
Babality — Forward, Back, Forward, Circle in jumping distance
Stage Fatality — Down, Back, Forward, R2 at close range