Anyway, on to the fighter. Overlord is fittingly, the roller of the planet Sagar, where Astronaut John Blackstar crash lands after being sucked through a wormhole. The Overlord seems to unite the two halves of the PowerStar, a relief that would give him unimaginable power. He possesses half of it, the Power Sword while Blackstar wields the other half, the Star Sword. Each half of the PowerStar is still very powerful, granting abilities to each of their owners.
Other powers granted by the sword - when powered up, the energy is so bright it's blinding, it can project an image of where the other half is located, and can deflect energy blasts from the other half (presumably it can block other energy blasts as well). It also grants immense strength to the user, allowing the Overlord to survive getting crushed by a rockslide. Blackstar is shown to lift a boulder over his head, and we can estimate Overlord can too.
The Overlord himself is no slouch, capable of plenty of feats, like levitating the sword to his hand if he loses it, some sort of flight (either hovering or turning himself into a tornado), and hypnotising someone with beams from his eyes, though that one might be attributed to Vizier, the Overlord's companion.
Other one-off powers he has include creating a sandstorm from his hands, and shooting energy from his hands without the sword. Seeing that Blackstar hasn't shown those powers, they could be the Overlord's personal abilities, it they could be found in the writing. Seeing as Bad Guy Beatdown only users powers that show up more than one time, most of these won't apply to the fight, but the levitation will be kept.
Make sure to check back next week when we'll look at the Overlord's opponent, Spiral Zone's own Overlord.