Clement Darling is the true main antagonist in The House of the Dead: Overkill.
Clement was the warden of a jail, beneath which the U.S government had constructed a vast underground laboratory where it was conducting secret research with a view to creating stronger, more resilient soldiers.
The project was eventually forgotten about and the laboratory remained sealed under the prison until Clement discovered it.
Clement found a use for this laboratory - he was scared of losing the one person in the world he cared about - his mother (the game heavily suggests the fact that Clement and his mother were engaged in an incestuous relationship.) He discovers within the lab the secret project known as "Formula X" with which he hopes to grant his now aging mother a new lease on life.
To do this, he uses Papa Caesar to test and refine the formula. He then proceeds to transplant his mother's brain into the youthful body of Varla Guns. Unfortunately, the procedure is a failure and Mother/Varla mutates into a giant abomination.
- Clement's voice actor, Vince Mola, also starred in the psychological thriller Head Trauma.
- Clement has a small resemblance to the Silent Hill 4 antagonist Walter Sullivan, as both were dangerously obsessed with their mothers and became homicidal as a result of that obsession.
- His physical appearance is similar to Sergei Dragunov from the Tekken series of fighting games.