Ultra Q
Reportedly, Eiji Tsuburaya considered this series his masterwork because the focus was on the people, rather than on the vehicles and special effects (the show never had any monsters or aliens, as his more famous shows "Ultra Q", "Ultraman" and "Ultra Seven" did). This focus on the people was similar to the works of Gerry Anderson, of which Tsuburaya was a big fan. The Mighty Jack mecha/HQ featured in this series also has some similarities to Tsuburaya's previous TV masterpiece, "Ultra Seven".