Dragon Ball Z - episode 39 - 06 Mar, 1990

Gohan, Krillin, and Bulma blast off to Namek. On the way, they run into what appears to be an invisible spaceship. They enter the ship, only to discover that it's full of traps. After getting through what seems to be all the traps, Gohan, and Krillin feast on a table full of food despite warnings from Bulma. They soon realize their mistake when children with guns holding Bulma hostage come into the picture, forcing the two young warriors to stand down in order to ensure her safety. (Source: Wikipedia)