Doctor Mandibus is one of the best criminal doctors in the galaxy. He is extremely talented and capable of implanting cybernetics and reworking brain tissues, including up to changing a persons personality to any of his choosing. He has many surgical tools implanted on his own body. For a price he will do any job.

Geatar brought Nebula to this doctor after they escaped from Titan. He was able to take her out of her catatonic state and repair her brain and body. He also restored her original personality.