 Davis is actually Smallville 's interpretation of the comic book character Doomsday , the only character to have succeeded at killing Superman . In Smallville , Doomsday is represented as a " nice guy " paramedic , who grew up moving from foster home to foster home . His storyline is considered " very dark " in that the character uncovers horrible truths about himself as season eight progresses . Brian Peterson explained that he , and the rest of the new executive producers , were looking for a villainous character that was " as great as Lex " , with Michael Rosenbaum 's departure at the end of the seventh season , and Doomsday fit what they were looking for . Although Witwer portrays Davis Bloome , who becomes the creature known as Doomsday , he does not actually wear the prosthetic body suit that was created for when Davis transforms into his monstrous counterpart . Instead Dario <unk> , a stunt double , who stands at 6 @-@ foot @-@ 8 , performs the role of " Doomsday " when the creature appears throughout the season . 
