The Zorgons are an alien race of reptilian creatures and they are the main villains in the book and 2005 movie Zathura.
They were summoned by the game by Walter and Danny while continuing the game.
The first Zorgon spaceship first found the boys before the others and using energy cannons to attack the house while tracking them with a heat source, but the stranded astronaut, whom summoned later, removed and replaced the source and left them off course.
However, much later, Lisa turn back the water heater, returning them back to the house just few moments before the boys and the astronaut attempted to lure the aliens with their own schemes (by burning flammable objects they can find) which also panicking her in process. As result, instead of one ship, 3 Zordon ship approach the house and invade it. The protagonists then schemed the way to deal the threat, but realizing that the game board have been thrown into the basement out of the boys' bickering either, forcing Danny to snuck into that place.
As Danny retrieved the game, the zorgons noticed him and give chase. He was saved by Walter at the last moments, only for confronting the defected robot they knocked earlier and have repaired itself. Using reprogram card, Walter fixed the robot's programming, turned it to their side and attacked Zordon to their ships, crashing them on the space in process.
They later returned to destroy the house with a large fleet, but Danny rolled onto Zathura and the fleet and the house were sucked into a black hole returning the house to earth.