Source: 1st appearance - Infinite Crisis - Fight for the Multiverse #10 (2014)
Type: Alternate Earth (non-canon)
ADDITIONAL INFORMATION FROM THE GAME ITSELF (my thanks to Sam Lowe): K.A.L. was a Kryptonian science probe found by Clark Kent, who befriended him. They played the game "Superman", where Clark was Superman while K.A.L. played Metallo. Clark was later killed by a drunk driver, his death inspiring K.A.L. to become Superman.