The Resurrection of Shotaro
Tetsujin 28 makes his return with Shotaro at the controls. Source: crunchyroll
Aired 08/04/2004EP 1 - The Resurrection of Shotaro

2004
Tetsujin 28
In post-WWII Japan, Prof. Shikishima has built up Shikishima Industries to be a technological powerhouse, working on developing robots. However, at the heart of their success lurks a dark secret from the war, something that cost the life of Prof. Kaneda, the mentor of Prof. Shikishima. Now Kaneda's son, Shoutarou, is about to learn the truth, and it will change him forever.
(Source: Anime News Network)