What are your top Sci-fi horror combo movies?

What movies that combine Science Fiction and horror do you like?

My picks are:

"The Thing (1982)".
"Aliens".
"Alien".
"Predator 1 & 2".
"Phantasm".
"Re-Animator".
"The Blob (1958 and 1988)".
"The Thing from Another World".
"Them!".
"The Deadly Spawn (a.k.a. Return of the Aliens)".
"Day of the Dead".
"Event Horizon".
"Videodrome".
"Scanners".
"The Fly (1986)".
"The Dead Zone (1983)".
"Night of the Creeps".
"Critters 1 & 2".
"28 Days Later...".
"Warning Sign". (Always been a favorite)
"Evilspeak".
"The Crazies".
"Bad Taste".
"The Faculty".
"Lifeforce".
"Doom".
"Killer Klowns from Outer Space".
"Halloween III: Season of the Witch".
"Let Sleeping Corpses Lie (a.k.a. Living Dead at the manchester Morgue)".
"The Mole People".
"They Live".

I wouldn't really call some of those you named Sci-Fi.

Anyway, for me, there's Alien, Predator, They Live, The Thing, Killer Klowns, and Critters.

The Thing, Event Horizon, The Faculty, Alien and Night of the Creeps.

Aliens is in my top favorite movies but it's more Action/Sci-Fi.

The Fly

Event Horizon.

Aliens, the thing, Brazil, Terminator, 12 monkeys, body snatchers, back to the future, children of men, matrix

I loved Brainscan with Edward Furlong.

The Alien and Predator films, Event Horizon, Supernova, and Sphere come to mind.

2 of my favs are

Event Horizon
Dark City

Alien, Aliens, The Keep, predator 1+2 and the faculty