Masters' Blasters were team of three teenage ghost hunters, created by Vlad during "Phantom Planet" to upstage Danny Phantom and take his position as Amity Park's hero, but the goal was foiled after Vlad revealed his identity to the world.
They presumably disbanded, because Danny was regarded as Earth's hero around the world.
Thrash was voiced by Dee Bradley Baker, who also voiced Rex, Clone Troopers and all the members of Clone Force 99 in the Star Wars: The Clone Wars.
Vid was voiced by Colleen O'Shaughnessey, who also voices Jazz Fenton in the same series.
Download was voiced by Rob Paulsen, who also voiced Jack Fenton in the same series.