​Jebediah's curiosity eventually led him to construct a machine that enabled him to travel through time and space. After going through the portal for the first time and returned, something mysterious happened to him. He gained some new abilities like superhuman strength and resurrecting dead bodies. His personality is also changed, as he is now obsessed to collect every human bodies and resurrecting them as his slaves.

His "Tall Man" nickname comes from Michael "Mike" Pearson, the main protagonist of the first film. Because Mike at that time didn't know Tall Man's true identity, he simply referred him as "the Tall Man" due to his tall posture.