During the first arc of the "Superman/Batman" series written by Jeph Loeb, what appears to be the Kingdom Come Superman appears via a Boom Tube in the Batcave with the intent to kill Clark Kent, because according to him, Clark is responsible for the destruction of the Earth. Kingdom Come Superman suddenly vanishes while being distracted by his past self calling him "Clark". It is eventually revealed that this Superman came from a future in which a kryptonite meteorite crashed to the Earth.