Assignment Terror - 1970 - 5/10
AKA - Los Monstruos del Terror

Lo, advance agents from planet Ummo, 14 lights years distant.
Mission, make Earth suitable for colonization after obliterating humankind.
Easy, correct? They can impersonate humans, have mastered interstellar travel, plus, check out all that cool gear behind the pair. Lights, SciFi equipment, tube amplifiers, other gadgets.
So, their master plan?
Resurrect a vampire, a werewolf, mummy, and the Frankenstein monster.
Next, unleash the beasts!
If you can accept that premise, you probably watch a lot of similar junk.