Le secret de Gigi

Giru convinces Trunks to land on his home planet, since he hasn't been there in years. They walk into a city that seems deserted. Thousands of Giru-like robots appear, and they all seem to know him. The three get hungry, so they go in search of food. They are confronted by a group of incredibly powerful robots who call themselves the Sigma Force. Giru jumps up to the platform they're on to join them. One of the robots disintegrates, and then reforms around Goku and Trunks, trapping them. As Pan curses Giru for betraying them, the robots, including Giru, fly away to General Rilldo.(Source: Wikipedia)