The answer is that there are still some iconic titles that have yet to be licensed, as well as some lesser known but still notable works... and we begin the second half of this list with easily the most confounding gap of them all.
Seriously, how is it even possible for this anime to be in a list like this, especially considering how many other vintage mech anime of the era have since seen official English release? Anyway, in 1972 Go Nagai revolutionized how giant robots were seen with Mazinger Z, as it was the first one to feature a proper pilot that operated the mech directly via a cockpit that was a part of the robot itself. Created as a media mix project the TV anime version by Toei Animation aired on Fuji TV, and by early 1974 was still running... but Fuji TV wanted more. Therefore, Toei's Ken Ariga proposed a mech anime where the giant robot was formed by the combination of three units, each with its own pilot, and the order they combined in resulted in multiple forms. While initially confused by the concept Go Nagai agreed to move ahead, but since he was so busy with other titles he decided to hand this new mech series over to his friend & assistant Ken Ishikawa... and the rest is history. On April 4, 1974 the first episode of Getter Robo debuted on Fuji TV, which saw three pilots (Ryoma Nagare, Hayato Jin, & Musashi Tomoe) work together to protect humanity from the Dinosaur Empire using their respective Getter Machines, which can combine together to form Getter Robo, which had three different forms depending on how they combined.
The Getter Robo anime was a massive success, solidifying the concept of the combiner mecha, & after 51 episodes would be followed up by a sequel series, Getter Robo G, that ran for an additional 39 episodes from 1975 to 1976. Ironically, Getter Robo G actually saw release in English as part of Force Five in the 80s, as Starvengers, so it's actually ineligible for this list. Meanwhile, Ken Ishikawa took the concept he helped create with Getter Robo & made a manga version of the story, one that eventually would become a massive franchise of works that created an epic magnum opus for the man and showcased the maddening, frightening, & essentially Lovecraftian power that were the Getter Rays that powered Getter Robo & its successive mecha. It would be Ishikawa's manga take on Getter Robo that would heavily influence the direction most Getter Robo anime would take from then on out... and most of those later Getter Robo anime would see official English release, with the only exception being Toei's Getter Robo Go anime from 1991/1992, which itself was a loose adaptation of Ishikawa's Shonen Captain manga (that did see English release via Viz as Venger Robo, though it was unfinished here). Today, Getter Robo is seen as one of the most important & iconic works to come from Go Nagai & his team at Dynamic Pro, right up there with Mazinger, Cutie Honey, & Devilman, and the continual release (& re-release) of the later Getter Robo anime productions (Armageddon, Shin vs. Neo, New Getter, & most recently Getter Arc) in English proves that there's just enough of a fanbase for the franchise... which makes the fact that the very first Getter Robo anime has still never seen an official English release (yet the sequel did, go figure) absolutely mind-boggling, especially since we have received fully subbed releases for both Mazinger Z & Great Mazinger.
Maybe there's some sort of weird hold up, or something, but hopefully one day the very first combiner mech anime will finally get its proper due over here.




