Astrys Pictures' 1951 double feature Ultimatum from Planet Omega & The Sinister Return of Dr. Abyzmos starring Alivia Chambers... and its 1958 sequel Captain Cadence Danforth and the Space Pirates of Alpha Prime starring Jillian Adams... now together in one volume with new introductory material!See androids fighting, ray gun battles, rocket ships, scream queens, evil villains, and of course the vintage 1950's-style action heroine Captain Cadence Danforth herself as she saves the day with help from her valiant crew of the space vessel Valkyrie.Flash Gordon better watch out...