Trigun Episode 16: Fifth Moon
Episode 16 of 26 of Trigun, aired July 23, 1998, 25 minutes. Available with English subtitles and dub where released.
Episode summary
Vash is challenged to a duel inside an inhabited city with two of the Gung-Ho Guns. The plot thickens as Legato butts in and unleashes Vash's horrible secret.