Commander (later General) Branko is a one minor villain in Voltron: Legendary Defender.
When Branko was in Olkarion he occupied it and forced the Olkari people to build the big and floating weapon cube. If he was would be able to destroy the Olkarion then Zarkon would have given him for his return to the service with his troops. But Pidge from Team Voltron beat the cube and then he and his troops had to leave the Olkarion when they lost the cube and the city management. He was later among the commanders present when Haggar ordered that Prince Lotor be summoned after Zarkon was left in critical condition by a battle with Voltron. When he made an attack to Olkarion again in season five, Voltron destroyed him and his cruiser.