Glunder's name is a combination of the words glare, referring to its eyes on either side of its body that are wide open, and thunder, referring to its electric attack.
Glunders debuted in Brawl's Subspace Emissary. They look like black tires that roll along floors, walls, and ceilings (however, they never stop rolling if left alone, which often kills them during locked battles). If a Smasher is close by, a Glunder will stand still, open up, and release a flash of electricity. The attack hits several times and is difficult to escape; the last hit has decent knockback. Like electric Jyks, Glunders only appear in levels located in the sky.