"I knew a little about orbit, but not enough to save anyone," Glover tells PEOPLE exclusively at the 40th Toronto International Film Festival
The film stars Matt Damon as a botanist on a mission to Mars who gets left behind after a brutal windstorm. It opened to glowing reviews, making The Martian one of the early hits of the festival.
But even though he plays a NASA scientist, Glover’s experience on the film didn’t exactly prepare him for a rescue mission.
“[If you’re lost in space], call me to let me know. It would be kind of cool that I was the first person you contacted,” he adds, “but definitely not to get help.”