From Dragon Ball Encyclopedia, the ''Dragon Ball'' wiki
The Galaxy Soldiers (銀河 戦士, Ginga Senshi; Literally meaning "Galaxy Warriors") are a mercenary platoon who work under Bojack, a ruthless alien formerly locked within of a star by the four Kaios. With North Kaio's death following the destruction of his planet during the Cell Games, the link holding Bojack trapped is shattered and he escapes. Tracking the energy coming from the Cell Games to Planet Earth, Bojack travels to the planet with his Galaxy Soldiers, Bido, Bujin, Kogu, and Zangya.
The Galaxy Soldiers appeared in Dragon Ball Z: Bojack Unbound. They infiltrated a Tenkaichi Tournament funded by X.S. Cash for his son's birthday. Bojack seeked to eliminate every single fighter on Earth in order to be rid of any obstacles in the way of universal conquest. While the Galaxy Soldiers frequented the arenas, Bojack waited calmly in a ruined city where the final challenge of the tournament was to take place.
Eventually, the mercenaries gathered the bodies of Future Trunks (who was successful in slaying Kogu), Kuririn, Yamucha, and Tenshinhan. Son Gohan, the only fighter still left standing, lashed out at Bojack until interrupted by the Galaxy Soldiers. Eventually, Gohan transformed into Super Saiyan 2 and effortlessly wiped out both Bujin and Bido. Becoming desperate despite insisting that Gohan could not stop him, Bojack sacrificed his remaining underling, Zangya, when he pushed her towards Gohan and fired an energy wave straight through her. Gohan evaded this, prompting the delirious Bojack to attack head-on only for Gohan to land a punch straight through the tyrant's stomach. Bojack launched his ultimate attack, the Galactic Buster, which Gohan countered with a Super Kamehameha. The two energies clashed and resulted in an explosion through which both Gohan and Bojack rushed into to attack each other, however, one final punch by Gohan into the flash of light ultimately killed Bojack.
Dragon Ball Z: Fusion Reborn
The Galaxy Soldiers also appeared in Dragon Ball Z: Fusion Reborn.