He Knows You're Alone (1980) Scream Factory

[DR Herbert West]

now you see him. Now you don't. The face of a killer appears out of the darkness and just as quickly disappears. A young woman has an eerie feeling someone is stalking her. Another beauty steps into a shower ... And a bathroom door handle slowly turns. We're in slasher-flick territory – and also in a rare realm of film history, because screen icon tom hanks makes his movie debut in this shocker.

The up-and-coming legend plays the brief supporting role of elliot, a psych major whose musings about the nature of fear reinforce the tone of this twisted tale about a sicko who targets brides-to-be ... And a detective who scrambles to stop the carnage. Wedded bliss can be very short-lived when he knows you're alone.