When does Gigantor return?

Gigantor (Japanese: ??28?, Hepburn: Tetsujin Nij?hachi-g?, lit. "Iron Man No. 28") is a 1963 anime adaptation of a manga by Mitsuteru Yokoyama released in 1956. The show follows the exploits of Jimmy Sparks, a 12-year-old boy who controls a giant flying robot with a remote control.