Nezi, also known as Commander Nezi, is the leader of the Sigma Force and a villain in Dragon Ball GT.
Nezi and the Sigma Force are called in by General Rilldo to take down Goku, Pan, and Trunks. Nezi and his companions, Natt, Ribet, and Bizu, manage to capture Goku and Trunks and bring them to Rilldo.
Later, after Natt is destroyed, Nezi, Ribet, and Bizu combine into the Sigma Force Cannon to fight Goku. Though the win at first, the saiyan manages to destroy them.
Nezi can fly and fire lasers from his eyes, as well as use the Afterimage technique, a technique where the user moves so fast, they leave an illusion of themselves behind. He can also liquefy his body, which allows him to entrap people in his body, as well as fuse into the Sigma Force Cannon with Ribet and Bizu.