The Moon-Ball is a large spherical bouncing ball that Luna Girl used to steal various items from the city such as toys, sports equipment and more. It is powered by the Luna Magnet and has the ability to suck anything that Luna Girl wants up. Luna Girl also managed to suck Owlette into the ball for a short time until Catboy and Gekko were able to pop it with a flag pole at the Museum, releasing Owlette and all of the objects Luna Girl stole.
Two more variations of the Moon-Ball are known to exist:
In "Night of the Cat", there is a smaller version of the Moon-Ball in which it was able to electrocute people with its moon energy.
In "The Prank Wheelz", there is another version of the Moon-Ball that is small like the first variation, but it lacks any abilities.