Dragon Ball Z Episode 132: Follow Dr. Gero
Episode 132 of 291 of Dragon Ball Z, aired March 18, 1992, 25 minutes. Available with English subtitles and dub where released.
Episode summary
Android 20 prepares to absorb Piccolo to get stronger, but Gohan comes just in time to save him. As Piccolo fights the Android, Trunks returns to the past and has discovered something different about these Androids- he never saw them before! If that's the case, then where the Androids he warned about?