American character actor who played Mercer, a nervous member of the Terra Prime movement working at the Orpheus mining facility, in the fourth-season Star Trek: Enterprise episode Demons.
Patrick Fischler is an American character actor with a long list of film and television credits, among them one visit to Star Trek.
In Demons he plays Mercer, a follower of John Frederick Paxton employed at the lunar mining complex that serves as Terra Prime's base. Mercer is caught up in the affair of the hybrid human and Vulcan infant whose existence the movement has kept hidden.
Paxton has little patience with him, and the character serves mainly to show how the movement's leader treats those he regards as unreliable. The episode leads directly into Terra Prime, the last story of the series set in its own time.