Skip Bolen/Getty Linda Hamilton chats with PEOPLE about her new movieOsirisand the idea of retirement "Retirement is a lot harder than working, it turns out," she says with a laugh Osiris, from director William Kaufman, is now available on demand Linda Hamiltonisn't use to slowing down. TheTerminatorlegend, 68, is still flexing her action chops with her new role in the sci-fi flickOsiris.And as the actress she tells PEOPLE, the role was "a lucky little accident." "I replaced an actor who had a medical problem, so they came to me very last minute," she says of the project. "They offered me that actor's price. We didn't even negotiate. They were in a pickle, so it was a lot of money to step in, with maybe 10 days notice and three hard days of work." The film follows "a team of Special Forces commandos" who "wake up on an alien spacecraft with no memory of how they arrived," per an official synopsis. Soon, "They horrifically discover they are being hunted by a merciless Alien race." Hamilton plays Anya, a Russian woman who has survived more than 20 years onboard the ship and teams up with the commandos to fight their horrific surroundings. Never miss a story — sign up forPEOPLE's free daily newsletterto stay up-to-date on the best of what PEOPLE has to offer, from celebrity news to compelling human-interest stories. Vertical The most difficult part of makingOsiris, according to Hamilton, wasn't any stunts, but nailing the Russian accent of her character, for which she worked with a dialect coach. "I loved working with the dialect coach and I loved going into a terrifying job with mouthfuls and mouthfuls of stuff, more than I've said in my entire career," she tells PEOPLE, "and treating it like a piece of theater and going in with my s--- together and with everything memorized so I can just play with it, like it's onstage." "I'm really enjoying that. I just get so excited sitting here with a script," Hamilton adds. At this point in her life, now that her two kids are all grown up, "I get to do work now the way that I always wanted to work, [in terms of ] time, and I'm not raising children and I'm not cheating them if I sit with my script all day long," she explains. "And I have to say, I'm enjoying it so much." WhileHamilton considered retirementahead of her upcomingStranger Thingsseason 5role due to hip pain, it's not so straightforward for her to just step away. "I worked straight for three years, 'cause I was doingResident AlienandStranger Thingsthe same year," she tells PEOPLE. "And I sneaked in another film while I was doingStranger Things, and then I had to go straight off and finish offResident Alien, and I'm tired. Really, really tired." "But retirement is a lot harder than working, it turns out," Hamilton adds, laughing. https://people-app.onelink.me/HNIa/kz7l4cuf TheDante's Peakactress told PEOPLE back in June that she does have a desire to seek roles that are a little less "tough" — noting that she'd be interested in something more "cuddly." She doesn't have a specific genre in mind, but is open to something "quirky and weird" — and there's a specific filmmaker she'd love to collaborate with. "I'd love to work withWes Andersonand some of the off-center directors," Hamilton says. Osirisis now available on demand. Read the original article onPeople