D4 (or D4 Mortal Unit[2]) is a 2010 horror film, directed and written by Darrin Dickerson.

It stars Vicki Askew, Ella Bell and Eric Berner.

D4 follows a team of special ops mercenaries on a mission to rescue a kidnapped kid believed to be held in an abandoned government facility.

Hired by the boy's mother, a wealthy doctor with high reaching influence, all seems to be an easy job.

But as things unfold, what was meant to be a simple search and rescue turns into a fight for survival.