Jonjo O'Neill

When Constantine's old friend accidentally releases a powerful demon, John is forced to determine exactly what he is is prepared to sacrifice in his battle with the underworld.

A paranormal experiment goes horribly wrong when a group of students tests a disturbing theory. Manny sends John to help his old friend, Ritchie Simpson, at Ivy University, where a group of his students have unknowingly found a way into an alternate dimension only to be met by a maniacal killer (guest star WILLIAM MAPOTHER).