Where's Shinzo? (The Kidnapping) (Kenichi searches Shinzo) (シンゾウ危しの巻) is episode 19 of the Ninja Hattori-kun 1981 anime.
Shinzou loses his way home and Hattori and the gang set off to find him. Kenichi assumes Shinzou has been kidnapped. After a lot of struggle, Hattori and Kenichi get shocked to find Shinzou with Koike-sensei.