During nearly the end of the episode, Gobu told his family "Tublat can't beat Tarzan on his own, he needs us!".
What he means is, without them, Tublat is nothing. So if they all worked together, they can beat Tublat, and stop him from forcing them to work for him.
Tublat makes an appearance on the series.
Animation Production by: Rough Draft Korea Co., Ltd.