Beginning as a more earnest Night of the Comet before swiftly morphing into an episode of the Twilight Zone without sacrificing its you-are-there vérité, Coherence is a low-budget chamber drama that firmly puts the psychological screws to its characters.
Frankly, casting Nicholas Brendon (“Buffy the Vampire Slayer”) as Mike, a washed-up former “Roswell” co-star, is so meta-inspired that “Coherence” could have coasted into conventional riff on “Night of the Comet” and still satisfied fans.