Hattori becomes a part of the Mitsuba family along with his brother, Shinzo and his ninja dog, Shishimaru.

Hattori helps Kenichi with his problems, constantly keeping an eye on him as a good friend.

A second manga series was published by Shogakukan in various kids magazines like CoroCoro Comic, Televi-Kun and others from 1981 to 1988.

Amazon Prime Video India began streaming the series in English, Tamil, Telugu and Hindi in December 2016.

In Vietnam, the series was re-released by POPS Kids on digital platforms and YouTube with a Vietnamese dub version by Purpose Media from 2018 and 2022.

[6] The announcement was part of a move to produce several remakes of popular anime television series to be broadcast across television stations in the Asian market to counteract Japan's stagnating domestic anime marketplace due to its declining birthrate.

[citation needed] The 1981 anime series was released on two, nine-disc DVD box sets by Columbia Music Entertainment in Japan.

[12] The Japanese dub of the 2012 series was released on a five-disc DVD box set, under the title Ninja Hattori-kun Returns (忍者ハットリくんリターンズ), by TC Entertainment, Inc. on July 11, 2014 in Japan.