"Alien" was so far ahead of its time that it's almost impossible to imagine it was made in 1979.

A sci-fi movie that managed to be the stuff of nightmares (instead of cheesy laughs) before special effects came into their own, it also gave us Sigourney Weaver's Ellen Ripley, a female heroine when Hollywood was still in its damsel-in-distress phase of casting women in movies.

RELATED: At the Olsen twins museum, what's on display is you

Then in 1986, "Aliens" pulled off something even more impressive — a sequel that surpassed its acclaimed origin story. To commemorate the film, theaters nationwide are holding themed screenings on Tuesday, April 26, and New York City scored the best fan event of them all: an appearance by Weaver for a post-show conversation at The Town Hall. Doors open at 7:15 p.m., and tickets are still available for $35.

Also on Tuesday, channel your inner Ripley when the aliens come for us in a pair of her sneaker-boots from the movies. Reebok is releasing high- and mid-top versions of the Alien Stomper, priced at $174.99. The limited edition kicks will be available online and at select retailers.