There's occasionally a divide between audiences and critics, with Rotten Tomatoes serving as the main barometer. Here are sci-fi movies with the biggest gaps.
Watch the first trailer for Kyle Mooney's horror comedy Y2K, which finds the turn of the century sparking '90s techno monsters at a New Year's Eve party.
Before James Cameron was a household name, Steven Spielberg offered a suggestion about how to write the Xenomorphs in Aliens. Thankfully, Cameron didn't listen.
Star Trek III: The Search for Spock actor Robin Curtis was understandably nervous about a deeply emotional scene involving her Vulcan character Saavik.