The Zirkonians are the unseen overarching antagonists of the 2009 sci-fi film Aliens in the Attic. They are a group of small aliens from their home planet Zirkon who bent on taking over planets and the universe and have searched the enlarging machine buried under the basement of the Pearson family's house from Earth for many years.
They send out the agent team, consisting of the leader Skip and his three comrades, Sparks, Razor and Tazer, to go to Earth to fix the machine and set up the beacons so they can prepare for the invasion.
When the Zirkonians have located the enlarging machine on Earth, they send out the agent team to travel to Earth and find the machine somewhere buried in the basement from the Pearson Family's house. The four aliens fly in their glowing pod spaceships to travel through the meteor show and arrive on Earth where they landed on the roof of the Pearsons' house.
Later, Sparks betrays his teammates and joins the Pearsons after meeting Hannah to stop them from getting into the basement and starting the invasion, but he is captured by his former comrades who need him to repair the enlarging machine.
At night, Skip succeeds in becoming giant with the machine and setting up the beacon fireworks to call the Zirkonian fleet that have arrived on Earth to start the invasion. When the children have finally defeated Skip and his minions and destroy the machine, Sparks calls off the invasion that the machine is destroyed by the humans, and the Zirkonian fleet retreat back to their planet.
Unaware that Sparks helped the humans, the Zirkonians may have received a failure contact of taking over Earth, but still continued to conquer more planets in universal conquest.
- The Zirkonians are thought to be the main antagonists in the film, since they're responsible of sending their agents to find the machine on Earth so they will start an invasion, but it's not true. Despite the alien race, Skip is the true main antagonist as he has much bigger impact than his kind, thus making them overarching antagonists before the film's climax.