Assignment Terror (1970) aka Dracula vs. Frankenstein (repost)

Aliens from a dying world plot to conquer earth by praying on man's superstitions. Bringing two dead scientists (Michael Rennie and Karin Dor) back to life, they use their knowledge to ... See full summary »

Directors:

 Tulio Demicheli (as Tulio Demichelli) , Hugo Fregonese (uncredited) , 1 more credit »

Writer:

 Paul Naschy (story)

Stars:

 Michael Rennie, Karin Dor, Craig Hill - via IMDB 

https://archive.org/details/AssignmentTerrorakaDraculaVs.Frankenstein-PaulNaschy