Zathura (the book version) is the sequel to Jumanji (the book version). It was written by Chris Van Allsburg and adapted into a fantasy film directed by Jon Favreau in 2005.The story picks up where the previous one left off: two boys discover the Jumanji board game where it was hidden and take it home. However, Danny, the younger of the pair, discovers another game also hidden inside the box: the sci-fi-based Zathura. Despite their ongoing rivalry, Walter and Danny find they must work together if they're ever going to beat the game and get back home.Note that while Zathura (the book version) is a literal sequel to Jumanji (the book version), the film is a Spiritual Successor to the Jumanji movie.Much like its predecessor, the film heaped on plenty of details that weren't in the original 32-pager, such as adding Lisa, Walter and Danny's older sister, and a mysterious astronaut who becomes a gruff mentor to the boys. It's also worth noting that, excluding voice actors or people wearing alien costumes which cover their whole bodies, the film has a cast of exactly five, one of whom is barely in the film. There are no extras, crowd shots, or other group scenes, and the movie takes place almost entirely in a single house.
This film provides examples of:
Adaptation Expansion: The boys gained a sister and an experienced astronaut mentor in the film, among other things.
Brick Joke: The bicycle seen orbiting the house while in outer space, which then crashes back to earth after they return home through Zathura.
Brother-Sister Incest: Lisa develops a crush on the hunky astronaut, who turns out to be an older version of one of her brothers. Once she learns this, she is, understandably, squicked out.
Cain and Abel: Walter in another timeline actually wishes his brother out of existence. He is unable to complete the game without the other player and ends up wandering the cosmos to look for a way to undo his mistake. He wised up the second time though with a little help from his future self.
Cassandra Truth: The boys try to tell Lisa what is happening but she quickly brushes them off. Their dad also wasn't any better about believing them.
Chekhov's Gun: A couple. For example, the Reprogram card, and the Astronaut also having a Fleet Admiral card.
When after insisting on allowing the astronaut to stay against his wishes, Walter asks Danny, "Who's brother are you, his or mine?" The correct answer is both.
The dumbwaiter, which they use to sneak past the aliens and get the game in the cellar
Decoy Protagonist: Danny appears to be the main character, much of the film focuses on his perspective, not to mention it's Danny who first started the game. Turns out Walter/the Astronaut's actions have far more impact than Danny's.
The astronaut seems to be there just as Alan's counterpart. He played the game long ago and got trapped in, the younger of the two brings him out, he knows about one of the things in the game, and is reset back to his younger self by the end.
Lisa for Sarah, ending up developing a crush on the astronaut. Walter for Judy, as his attitude is "Let's play and it'll all disappear" and Danny for Peter, as his attitude is "I'm not playing that thing".
Foreshadowing: "Someday you're gonna be really happy I got you that piano."
Harmless Freezing: Lisa gets frozen pretty early on for five turns and once those turns were up she unfroze without any problem, not even noticing that she had been frozen.
I Hate Past Me: The astronaut is noticeably a lot harder on Walter than he is on Danny. At first it seems because this is simply due to Danny "rolling" him out of the game, but actually the astronaut is a time-looped older version of Walter, who in his timeline wished his brother out of existence in anger after an argument and regretted it ever since. After years of reflection—and the fact that he can't continue the game since it was Danny's turn after he made the wish—he's more than a little resentful towards his past self's brotherly callousness, but ends up being very proud that the current Walter learned his lesson where he did not.
Jerk with a Heart of Gold: The film makes Walter out to be rather bullying and demanding towards the younger Danny. The astronaut also has his jerky moments, but has the benefit of experience. The Astronaut is notably only really a jerk towards Walter.
Pragmatic Adaptation: The original book was a direct sequel to Jumanji, set immediately after Judy and Peter got rid of the game (both games were in the same box; Judy and Peter simply didn't realize this, while Danny did and thought Zathura looked cooler). Since Jumanji's film adaptation came out in 1995, and Zathura's 2005, this had to be done.
Shoot the Shaggy Dog: The players manage to survive all the hazards and dangers and make it to their destination, Zathura, which turns out to be a black hole. The fact that it's actually the Reset Button makes this a subversion, but until the moment everything suddenly returns to normal, there's zero indication that they aren't about to die pointlessly.
Shout-Out: Early in the film, Danny is shown playing Jak 3: Wastelander. A poster for the game can be found in the bedroom after Walter wishes for a football signed by Brett Farve.
Sibling Rivalry: Between Danny and Walter. They work out the differences eventually though.
Surprise Incest: Lisa is obviously attracted to the astronaut before she finds out he's a future version of her brother.
Telescoping Robot: The robot from the game. It starts out small, then transforms into a human sized killing machine.
Thematic Series: At least in regards to the film version of this story and Jumanji. The books were a direct sequel but the two films are unrelated except for the concept of kids being trapped in a board game, leading some audience members to believe this was a rip-off.
They Plotted a Perfectly Good Waste: Invoked in Ebert and Roeper's review of the film (which gave it two thumbs up); Roeper commented that Walter and Danny's constant arguing does become pretty tedious... But that was probably the point, since the whole film was about them learning to be nicer to each other.
Timey-Wimey Ball: So, the first time he played the game, Walter never met an older astronaut, and he was stuck in space after wishing his brother away. The "second" time, which was actually the same time, they did roll up an astronaut for some reason, and things turned out differently. Or else they already met the astronaut the first time, when Walter wished his brother away, and no one knows where he went, leaving Walter alone in space till he was rolled up himself. (Also note: the astronaut quoted the card that rolled him up, so he seems to have seen it before). Another example: If the game granted the wish that the brother had never been born, he wouldn't have been the second player, so the game shouldn't have become unplayable. Furthermore, since the brother wouldn't have been there to start the game, the whole game should have been undone.
What Happened to the Mouse?: The results of Walter wishing away Danny in the first timeline are very ambiguous. It's never explicitly mentioned where Danny was sent, nor is it mentioned what happened to Lisa or what occurred in the real world while Walter was gone.