Movies Like Stepsister from Planet Weird

If you liked Stepsister from Planet Weird (2000), a family and science fiction movie directed by Steve Boyum, here are 20 movies with a similar feel, based on TMDB's recommendations. Each one links to its cast, trailer and where it's streaming.

1
My Stepmother Is an Alien (1988)
★ 5.8/10Also comedy and science fiction
Trying to rescue her home planet from destruction, a gorgeous extraterrestrial named Celeste arrives on Earth and begins her scientific research. She woos quirky scientist Dr. Steve Mills, a widower with a young…
2
Leroy & Stitch (2006)
★ 6.5/10Also tv movie and family
Lilo, Stitch, Jumba, and Pleakley have finally caught all of Jumba's genetic experiments and found the one true place where each of them belongs. Stitch, Jumba and Pleakley are offered positions in the Galactic…
3
Ben 10: Alien Swarm (2009)
★ 6.2/10Also tv movie and science fiction
Ben and a mysterious girl from his past must prevent an alien threat from destroying the world.
4
Titan A.E. (2000)
★ 6.6/10Also science fiction and family
A young man finds out that he holds the key to restoring hope and ensuring survival for the human race, while an alien species called the Drej are bent on mankind's destruction.
5
Ben 10: Race Against Time (2008)
★ 5.9/10Also family and science fiction
Ben, Gwen, and Max must stop an extraterrestrial who plans to open a gateway that leads to an alien invasion.
6
Phineas and Ferb: Star Wars (2014)
★ 7.1/10Also comedy and family
Phineas and Ferb become the galaxy's unlikeliest last hope when they must return the Death Star plans to the Rebel Alliance.
7
Stitch! The Movie (2003)
★ 6.4/10Also family and comedy
The continuing adventures of Lilo, a little Hawaiian girl, and Stitch, the galaxy's most-wanted extraterrestrial. Stitch, Pleakley, and Dr. Jumba are all part of the household now, but what Lilo and Stitch don't know…
8
Real Men (1987)
★ 6/10Also comedy and science fiction
A womanizing CIA agent and an insecure insurance agent are paired together to make sure a deal goes through with aliens for the future of mankind.
9
Zenon: Girl of the 21st Century (1999)
★ 6.1/10Also family and comedy
Zenon Kar, a 13-year-old girl who lives on a space station in the year 2049, gets into some trouble and is banished to Earth. With help from some Earth friends she must find her way back.
10
Planet 51 (2009)
★ 5.9/10Also family and comedy
When Earth astronaut Capt. Chuck Baker arrives on Planet 51 -- a world reminiscent of American suburbia circa 1950 -- he tries to avoid capture, recover his spaceship and make it home safely, all with the help of an…
11
Journey to the Center of the Earth (2008)
★ 6.1/10Also science fiction and comedy
On a quest to find out what happened to his missing brother, a scientist, his nephew and their mountain guide discover a fantastic and dangerous lost world in the center of the earth.
12
Lilo & Stitch (2025)
★ 7.2/10Also family and science fiction
The wildly funny and touching story of a lonely Hawaiian girl and the fugitive alien who helps to mend her broken family.
13
The Suite Life Movie (2011)
★ 6.1/10Also comedy and science fiction
Cody and Zack are approached to join the Gemini Project, a high-tech research center studying the dynamics between twins. Shockingly, they find themselves interconnected in a whole new way! When one twin experiences…
14
The Ewok Adventure (1984)
★ 5.8/10Also family and science fiction
Wicket the Ewok and his friends agree to help two shipwrecked human children, Mace and Cindel, on a quest to find their parents.
15
Girl vs. Monster (2012)
★ 6.3/10Also family and comedy
Skylar finds out that her parents are monster hunters after she accidentally releases some monsters from a secret containment chamber; so she and her techno friends must recapture all the monsters and also save her mom…
16
Home (2015)
★ 6.8/10Also comedy and science fiction
When Earth is taken over by the overly-confident Boov, an alien race in search of a new place to call home, all humans are promptly relocated, while all Boov get busy reorganizing the planet. But when one resourceful…
17
Ben 10: Secret of the Omnitrix (2007)
★ 7.5/10Also science fiction and family
After a battle with Dr. Animo in a power plant, Ben notices something strange is happening with the Omnitrix but doesn't tell anyone. Tetrax arrives and tells them the Omnitrix is broadcasting a self-destruct signal…
18
Father of the Bride (1991)
★ 6.5/10Also comedy and family
George Banks is an ordinary, middle-class man whose 22 year-old daughter Annie has decided to marry a man from an upper-class family, but George can't think of what life would be like without his daughter. His wife…
19
E.T. the Extra-Terrestrial (1982)
★ 7.5/10Also science fiction and family
An alien is left behind on Earth and saved by the 10-year-old Elliott who decides to keep him hidden in his home. While a task force hunts for the extra-terrestrial, Elliott, his brother, and his little sister Gertie…
20
Big City Greens the Movie: Spacecation (2024)
★ 7.6/10Also family and comedy
When thrill-seeker Cricket tricks his family into taking a "road trip" in space, chaos in the cosmos quickly ensues. Despite growing frustrations between Cricket and his dad, Bill, the two must learn to appreciate each…