A Japanese dub of the classic animated series Doug exists, primarily covering the original Nickelodeon era. Titled simply ダグ (Dagu), it features a cast of prominent voice actors from the anime industry. Dub Details & Broadcast History
Finding the Japanese dub today is a challenge. It is largely considered "lost media" because it hasn't seen a modern home video release in Japan, and it is not currently available on Japanese streaming platforms. For many, it remains a nostalgic memory of early international cable TV in Japan. If you're interested, I can look into:
Supporting cast included:
Final Scene: Home
Roger Klotz, redesigned slightly with a pompadour and a more angular face, leans against the school gate. His voice is provided by Jouji Nakata—smooth, menacing, and absurdly deep.