Evils of the Night (1985)
Horny teens with big hair are kidnapped and held hostage in a garage. After physical and mental torture by two sleazy guys they are brought to a rural hospital that is actually a spaceship. The "doctors" are John Carradine and Julie Newmar playing aliens wearing ridiculously silly space suits. Their mission is to drain the teens youthful lifeforce or something like that.
B-Movie incorporating teen sex comedy, backwoods terror, slasher elements, torture porn and (obvious out of place) unintentional naive 1950s-like sci-fi that would've made Ed Wood proud. Also: Aldo Ray is in this (seems like he was in EVERY 1980s B-movie), two lesbian space nurses making out and plenty of lazerbeam zapping.
Doppelganger (1993)
A young writer rents a room to a pretty but strange young woman. Soon enough they both fall in love but the young woman is haunted by an evil alter ego.
The big draw here is Drew Barrymore shortly before her second career boost. Doppelganger wants to be many things, but it is mainly a cheap B-Movie trying hard to be stylish. Filmed in sunny L.A. the audience gets a whiff of early 1990s urban lifestyle and fashion on a budget, Danny Trejo kicked in the balls, Drew taking a shower and Drew doing a super sensual solo dance at a party to a corny 'Enigma - Sadeness Part i' rip-off song.