Dragon Ball GT 1x16

Giru convinces the Z warriors to land on Planet M2, his home planet. It is a trap though and Giru is greeted by General Rildo and is told he has done a good job of luring the humans to the planet. At the end of the episode the Z warriors meet up with a group of strong robots who call themselves M2's commandos. After a short fight the robots capture Trunks and Goku and take them away.