Watch a recap of the tactical shifts and scientific breakthroughs in this episode: Dr. Stone: Season 1 Part 1 (Full Recap) YouTube• Nov 21, 2020 Episode Summary

: Available on Crunchyroll and Amazon Prime Video .

: Senku identifies three essential ingredients for gunpowder: sulfur, charcoal (from burnt wood), and potassium nitrate (sourced from nitric acid found in the cave).

: Senku, Taiju, and Yuzuriha travel to Hakone to find a hot spring, which serves as a vital source of sulfur.