Starring Carter Jenkins, Austin Butler, Ashley Tisdale, Gillian Vigman, Andy Richter, Doris Roberts, Robert Hoffman, Kevin Nealon, Tim Meadows, and the voices of Josh Peck, J. K. Simmons, Kari Wahlgren, and Thomas Haden Church,[3][4] the plot revolves around the children in the Pearson family defending their vacation home against a group of aliens, who are planning an invasion of Earth until one of the aliens betrays them and joins the Pearson children in battle.

Produced by Regency Enterprises and Dune Entertainment, Aliens in the Attic was released theatrically by 20th Century Fox on July 31, 2009, in the United States.

In a Chicago suburb, Stuart Pearson and his wife Nina head a family that includes 7-year-old Hannah, 17-year-old Bethany, who sneaks out with her boyfriend Ricky Dillman, and 15-year-old techno-geek Tom.

Tired of being bullied for being smart, Tom fails his classes to appease his peers, but gets caught hacking into his school's website to change his grades.

Called "Zirkonians", the aliens plan to take over Earth and make Ricky attack the boys, but Tom and Jake manage to escape with Hannah and the twins' help.

Tazer shoots both Tom and Jake with mind control plugs, but they fall off harmlessly, as they are revealed to only work on adults, much to the annoyance of Skip.

The kids orchestrate a scheme to get the adults out of the house and then ambush the aliens using firecrackers as they try to reach the basement via the air vents, gentle and non-violent Sparks gets separated from the group and ends up in Hannah's room, where the latter befriends him and he reveals that he wants to return to his family.

Sparks helps the kids by creating weapons for them and reveals his teammates are seeking the "Sizematron", a machine buried under the basement for many years that will allow the Zirkonians to invade the planet.

The kids attack the aliens and rescue Sparks, however, Skip successfully uses the Sizematron, growing 30 feet tall and summoning the Zirkonian invasion ships with beacons.

The kids use the mind-control darts against the aliens, controlling Skip and sending him and a grown Tazer back to the machine to shrink them to regular size.

Having grown closer, the kids resume their vacation to enjoy a day of fishing with their parents, while Skip, having survived the explosion yet shrunk to an even smaller size, reappears and bent on revenge, only to be snatched away by a crow.

In March 2006, 20th Century Fox announced that they picked up Mark Burton and Adam F. Goldberg's script for the film, then titled They Came from Upstairs.

On Rotten Tomatoes the film holds a 34% rating based on 71 reviews with an average critical score of 4.6/10, with the site's consensus stating: "Inoffensive and kid-friendly, this mundane family comedy is light on imagination.

[citation needed] Entertainment Weekly described the film as "a pointless and harmless family adventure that doesn't mentally assault the 12-and-over set and looks like a lot of fun",[20] while San Francisco Chronicle called it unoriginal and crowd pleasing.

[27] Lara Martin of Digital Spy described the film as a "kid-friendly mix of Men in Black crossed with Gremlins with a healthy dose of Home Alone-style violence" and also mentioned that one of the biggest disappointments in the movie is the lack of screen time given to Tisdale, billed as one of the leading actors, who "gets a promising start as she rebels against her parents and struts around in her bikini, but she's quickly relegated to background fodder purely there to provide excess opportunities for the alien-controlled Ricky to shine" and concluded saying it seems "a bizarre and sad waste of her obvious comedic talent".

The game developers were Revistronic for the Wii, PlayStation 2, and Microsoft Windows platforms and Engine Software for the Nintendo DS, published by Playlogic.