Blastaar is a member of a race called the
Balurrians, based in the
Negative Zone. He ruled them for years as a brutal leader until they finally rose up and overthrew him, then sealed him up within a containment suit and set him adrift. It was only when the inhuman
Triton braved the Negative Zone to save an adrift
Mister Fantastic that the Explosive Belt around Earth revived Blastaar and he followed the pair through their portal and into the Baxter Building. There he met up with and joined the
Sandman in order to take over Earth, but the
Fantastic Four, with the help of
Crystal, beat him and used one of Reed's inventions to shut off his powers, allowing them to return him to the Negative Zone.
Since then, Blastaar has tried to return to Earth and conquer it, but has been repulsed many times by various super heroes; including the Fantastic Four and the
Avengers. While adventuring in the Negative Zone, the Fantastic Four have since run into Blastaar again on many occasions. Blastaar has also regained the throne of Baluur for himself, and then begun a conquest of the Negative Zone, which has been primarily kept in check by the interference of Blastaar's hated enemy,
Annihilus.