You can watch this episode and find it online in Hindi through TMDB or Facebook . Doraemon Season 1 - watch full episodes streaming online
In this 1979 Doraemon episode, titled "Transformation Biscuits" (Badalne Wale Biscuits), Nobita finds 22nd-century biscuits that turn whoever eats them into an animal for five minutes, causing chaos when his family members keep transforming. It's a classic episode featuring the popular Hindi voice cast from the mid-2000s era. You can watch this episode and find it