The three original Japanese films which went into Evil Brain from Outer Space (The Space Mutant Appears, The Devil's Incarnation and Kingdom of the Poison Moth) were 45 minutes, 57 minutes, and 57 minutes in duration respectively. The total 159 minutes of the three films were edited into one 78-minute film.
The original Japanese films that formed "Evil Brain from Outer Space" (The Space Mutant Appears, The Devil's Incarnation, and Kingdom of the Poison Moth) had a total runtime of 159 minutes.  This was then condensed into a single 78-minute film through editing.