Schizo (1976)
A newly married woman becomes convinced someone from her past is stalking her, but nobody believes her until the bodies start to pile up
Phase IV (1974)
Desert ants suddenly form a collective intelligence and begin to wage war on the inhabitants It is up to two scientists and a stray girl they rescue from the ants to destroy them
The Prisoner of Zenda (1979)
In order to save King Rudolph of Ruritania from assassins and murderous usurpers, the kingdom hires a look a like London cabby to impersonate the Monarch