20 best movies like My Grandpa is an Alien (2019)

Dolf a 15 year old boy is sent back in time by a timemachine. Accidentally he is sent back to the Middle Ages. He is rescued by children who are part of a childrens' crusade, on their way to rescue Jeruzalem. During the trip Dolf finds out the danger is not coming from outside the crusade, but from within.

In a world where people collect pocket-size monsters (Pokémon) to do battle, a boy comes across an intelligent monster who seeks to be a detective.

Five kids wake up in a world where everybody has disappeared.

After a sixteen-year absence, married scientists Claire and Matt Thompson reunite with The Jensen Project. The Jensen Project is a secret community of geniuses doing cutting edge research they share anonymously to help the world.

After the disappearance of her scientist father, three peculiar beings send Meg, her brother, and her friend to space in order to find him.

The Galactic Patrol is back - but they've lost Deputy Rod Allbright's body. It's been stolen by B'KR, the most fiendish villain in the galaxy, which leaves Rod's mind sharing one body with his annoying cousin Elspeth. Stranded on a mysterious alien planet, our young heroes embark on a mission to find the only being who can stop B'KR once and for all, the legendary time-strider himself; Art Allbright - who also happens to be Rod's dad. The Galactic Patrol's high-flying adventures continue in this thrilling second film based on the global best-selling book series from acclaimed author Bruce Coville and Simon and Schuster Children's Publishing. This rip-roaring sequel draws the crew of the Good Ship Ferkel into a web of alien plots that will test their courage to the utmost -- and ultimately bring them face-to-face with one of the galaxy's most guarded secrets.

In a hyper-linked social media age, an orphaned teenage girl, Jerrica Jem Benton, becomes an online recording sensation, and she and her sisters embark on a music-driven scavenger hunt - one that sends them on an adventure across Los Angeles - in an attempt to unlock a final message left by her father.

A group of kids must protect their vacation home from invading aliens.

An embarrassing video of Anthony surfaces online right before his fifth high school reunion. The Smosh dudes then race to pull down the clip before it blows Anthony's chances of reconnecting with his teen crush Anna.

A Mysterious Alien Creature (MAC) escaping from nefarious NASA agents, is befriended by a young boy in a wheelchair. Together, they try to find MAC's family from whom he has been separated.

Artemis Fowl is a 12-year-old genius and descendant of a long line of criminal masterminds. He soon finds himself in an epic battle against a race of powerful underground fairies who may be behind his father's disappearance.

An Edinburgh professor and assorted colleagues follow an explorer's trail down an extinct Icelandic volcano to the earth's center.

Former Gotham City District Attorney Harvey Dent, one side of his face scarred by acid, goes on a crime spree based on the number '2'. All of his actions are decided by the flip of a defaced, two-headed silver dollar.

Yet another variation on Mark Twain's "A Connecticut Yankee At King Arthur's Court." Here, a computer malfunction causes a science researcher to be sent back in time with her laptop, which she uses to amaze the court.

When a tiny intergalactic starship crashes into the bedroom of middle-schooler Rod Allbright, he is enlisted by the extraterrestrial Galactic Patrol, a group of out-of-this-world lawmen, and must race to save the world from Total Planetary Disaster with his cousin Elspeth.

Ivan is a 400-pound silverback gorilla who shares a communal habitat in a suburban shopping mall with Stella the elephant, Bob the dog, and various other animals. He has few memories of the jungle where he was captured, but when a baby elephant named Ruby arrives, it touches something deep within him. Ruby is recently separated from her family in the wild, which causes him to question his life, where he comes from and where he ultimately wants to be.

12-year-old Clara is just like any other girl until one day a mysterious black cat scratches her. Clara soon discovers that she can communicate with the cat and that she belongs to a family of Wild Witches with a strong connection to nature and animals. It turns out that Clara is a very special Wild Witch and that her blood can set free the ancient and evil witch, Bravita Bloodyoung. Together with her mentor aunt Isa and her friends, Kahla and Oscar, Clara must face her destiny and embark on a dangerous journey in order to save herself and the Wild World.

Sean Anderson partners with his mom's boyfriend on a mission to find his grandfather, who is thought to be missing on a mythical island.

A man-cub named Mowgli fostered by wolves. After a threat from the tiger Shere Khan, Mowgli is forced to flee the jungle, by which he embarks on a journey of self discovery with the help of the panther, Bagheera and the free-spirited bear, Baloo.

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 and dad from these monsters who are out for revenge.

When alien invaders capture Earth's superheroes, their kids must learn to work together to save their parents - and the planet.

After their father is called into work, two young boys, Walter and Danny, are left in the care of their teenage sister, Lisa, and told they must stay inside. Walter and Danny, who anticipate a boring day, are shocked when they begin playing Zathura, a space-themed board game, which they realize has mystical powers when their house is shot into space. With the help of an astronaut, the boys attempt to return home.

A lab accident gives a hound named Shoeshine some serious superpowers -- a secret that the dog eventually shares with the young boy who becomes his owner and friend.

Johanka and Matyáš have an unusual home. The two live among the animals and plants of an enchanted botanical garden in the middle of the city, but this idyll is under threat. To the children’s horror, the mayor wants to build a theme park on the same spot. The Blue Tiger, an animal with magic powers, comes to their aid. Only he can protect the garden, but Johanka and Matyáš must now stop the mayor from capturing their newfound friend. MODRY TYGR is a colourful, atmospheric and imaginatively told animated fairytale that inspires the viewer to reflect on natural resources and habitats.

Jack Shepard is an out-of-shape auto shop owner, far removed from the man who once protected the world's freedom. Reluctantly called back into action by the government, Jack is tasked with turning a ragtag group of kids with special powers into a new generation of superheroes to save the world from certain destruction.