Summary: Answering a distress call from a research laboratory orbiting Earth, Flash and Dr. Zarkov arrive too late to prevent a massacre that leaves all personnel floating dead in space.
Taking up hot pursuit of the laboratory’s escape launch in the company of the one survival, Flash and Zarkov are still to learn the chilling truth behind the research project responsible for the massacre and what horrors await them in space...
(Source of summary: www.ipcomics.net)
It's from Emile's e-collection. All credits go to her & "Allen Lane" who scanned and first shared at net.