The 1990s were a golden age for sci-fi, with hits like The Matrix and Terminator 2 setting the bar high. But for every classic, there were a handful of films that crashed and burned so hard they became legendary for all the wrong reasons. These movies had big budgets, big names, and even bigger concepts—but they failed to deliver anything close to watchable. Here are six of the worst sci-fi films from the '90s that are truly terrible from start to finish.
6. Super Mario Bros. (1993)
Based on the beloved video game, this film follows plumbers Mario (Bob Hoskins) and Luigi (John Leguizamo) as they stumble into a parallel universe ruled by the evil King Koopa (Dennis Hopper). The plot involves a dystopian city called Dinohattan and a scheme to merge dimensions. But instead of capturing the colorful, fun spirit of the games, the movie went dark and confusing. Fans were left scratching their heads at the bizarre tone and odd creative choices. It's widely considered one of the worst video game adaptations ever made—a true disaster that even the cast has publicly regretted.
5. Johnny Mnemonic (1995)
Keanu Reeves stars as Johnny, a data courier in a cyberpunk future who stores information in his brain. When he takes on a job that overloads his implant, he's hunted by powerful corporations. The film had some cool ideas about technology and memory, but the execution was a mess. Pacing issues, clunky dialogue, and flat characters made it hard to care about the story. Despite a small cult following, Johnny Mnemonic remains one of the weaker sci-fi entries of the decade—a promising concept that never found its footing.
4. Judge Dredd (1995)
Sylvester Stallone plays the iconic comic book anti-hero Judge Dredd, a law enforcer in a dystopian Mega-City One who can arrest, sentence, and execute criminals on the spot. When he's framed for a crime, he must uncover a conspiracy that threatens the city. Fans of the comics were deeply disappointed. The film focused too much on action and not enough on character development or world-building. Stallone's performance missed the mark, stripping Dredd of his signature grit. It's a missed opportunity that never lived up to its source material.
3. Lost in Space (1998)
Based on the classic TV series, this film follows the Robinson family on a mission to save humanity. Led by Professor John Robinson (William Hurt), they board the Jupiter 2 only to be sabotaged by Dr. Zachary Smith (Gary Oldman). Stranded in deep space, they must survive against all odds. Despite a strong cast, the movie was a letdown. The visual effects overwhelmed the story, and the tone was all over the place. Instead of reviving a beloved franchise, Lost in Space became a forgettable footnote in '90s sci-fi history.
2. Wing Commander (1999)
Freddie Prinze Jr. stars as Christopher Blair, a young pilot fighting an alien race called the Kilrathi. Based on a popular video game series, the film had a built-in fanbase, but it failed to deliver. Weak acting, a generic plot, and subpar visual effects made it a chore to watch. The characters were underdeveloped, and the stakes never felt real. It's a textbook example of a video game adaptation that missed the mark entirely.
1. Battlefield Earth (2000)
Though technically released in 2000, this film is often lumped in with '90s sci-fi disasters. Based on L. Ron Hubbard's novel, it stars John Travolta as a alien overlord who enslaves humanity. The movie is infamous for its laughable dialogue, over-the-top acting, and nonsensical plot. It's widely considered one of the worst films ever made—a perfect capstone to a decade of terrible sci-fi.
If you're looking for quality sci-fi, check out 2026's Best Sci-Fi Movies So Far: A Ranked List of Must-See Hits or Best Sci-Fi Movies Based on Books: A Ranked List of 10 Must-See Adaptations. But avoid these six at all costs—they're painful reminders that even big ideas can crash hard.
