Shin Mazinger Shougeki! Z-hen

Giant Robo and Shin Mazinger were directed by Yasuhiro Imagawa. Giant Robo is based on the collective works of Mitsuteru Yokoyama and Shin Mazinger uses elements from many of Go Nagai's previous projects. Both series attempt to present a comprehensive tribute to the authors of their respective source materials through an entirely new story. 

Both shows have the same director and have awesome narrators, with memorable lines, such as, "GUNDAM FIGHT! READY, GO!" and "SONOTORI! KARE NO NAMAE WA BUREIDO!". 

The original Gaiking and Mazinger series were both by Go Nagai and were animated by Toei. Due to Toei not giving credits to Nagai for the original Gaiking series, Dynamic and Toei have since gone into a long dispute. In fact, they fought over a bunch of stuff and the famous Dai Mazinger project that was blocked by Toei really created tension between both camps. I'd like to think that Gaiking is Mazinger's cousin, and both Shin Mazinger and the new Gaiking are excellent shows. They also share hot blooded characters.  

Both shows are Imagawa doing remakes of classic mecha, and have at times moving and often epic-scale plots with twists and tragic villains. 

Daimidaler has all the makings of a typical Go Nagai anime adaptation. It shares the same hot blooded main character, Endoh opening and an enthusiastic narrator, and of course, giant robots. To further illustrate my point, even the 3 professors in Daimidaler are a direct reference to the 3 professors in Shin Mazinger, namely Sewashi (Sewashiko in Daimidaler, ko to denote that they're female), Mori Mori (Moriko) and Nossori (Soriko). The action is also very fun to watch. Daimidaler gives a great sense of weight like Mazinger Z. And should I note that the character design for Kouichi resembles Mazinger's Kouji with thick sideburns? While Shin Mazinger doesn't have as many perverted scenes as Daimidaler, the show is exactly like another Go Nagai giant robot adaptation, known as Koutetsushin Jeeg with its overly lecherous MC. If you enjoy Daimidaler for all the reasons I listed above (hot blooded MC, giant robots, great action, music), then you will surely enjoy Shin Mazinger and other Go Nagai anime adaptations. read more 

Modern instalments of franchises that had their start in the old-school era of anime. Both are easy to get into with the The Woman Called Fujiko Mine being semi-prequel and Mazinger Edition Z: The Impact! being a remake. Watching this Lupin III series and Mazinger Edition Z: The Impact! together, I noticed similarities between the Kurogane 5 led by Tsuabasa Nishikori and the crew of Lupin III, Daisuke Jigen, Goemon Ishikawa and the centrepiece, Fujiko Mine. Like Goemon, Kikunosuke and Sensei are both stoic and the latter is a master swordsman, Lupin and Yasu the Weasel are both mischievous/perverted criminals. Similar to Daisuke Jigen's roles, Cross is the muscle of the team and Django is an expert on guns. read more 

Non human threats to world being fend off against with mecha, visual treats of fights and also some time loop/timeline twist shenanigans. Basically imagine Evangelion but if Shinji was hot-headed. 

Both shows are about Giant Robots , and with super cool action too  

They are 2000s reboots with retro art styles based on classic super robots series written by Go Nagai, aiming to be closer to the manga than their original 70s version. Both are filled with action, violence, JAM Project music and all the insanity one expects from Dynamic robots. 

These two anime are basically revisions of two older series by Go Nagai and giving them a new take on the original story. While there is no Mecha in Devilman Crybaby, they both have strange looking monsters trying to kill humanity and a young boy main character that must choose the path of good or evil. These two have plenty of action and story make these two shows perfect for both fans of the series.  

Getter and Mazinger, two of the ultimates in the Super Robot Genre. If you want ridiculously manly characters, insane action, kickass robots and ridiculous amounts of awesome, both deliver. Oh good lord do they ever deliver. 

Gekiganger is like the summary of a whole series at a very fast pace and Shin Mazinger does the same in it's first episode. 

Both are mech shows by famous authors. Nagai was inspired by western designs. Both Heroman and Shin Mazinger aired around the same time of year, one in 2009 and the other in 2010. They both have a lengthy opening arc and neither of them are episodic in any way.  

Old-school style and passion meets modern techniques and storytelling. Things explode and faces get punched - often.  

Both shows share the same basic concepts, famous characters and giant robots. The Mazinkaiser itself is a new, different mecha and everything happens within seven episodes. Shin Mazinger presents a fully alternative story that starts from the beginning, after showing us a taste of what's to come in its first episode, which can be enjoyed on its own. Mazinkaiser is also based on Go Nagai's Mazinger Z but it is aimed at a more mature audience, assuming a certain familiarity with the original material that isn't required by Shin Mazinger.  

Both series are re-imaginings of classic Go Nagai properties, and if you're a fan of Go Nagai, you'll love Dororon Enma-kun Meeramera. It's filled with references to his work as well as references to 1970s Japanese pop culture. 

Youngster receives an amazing power from their mad scientist grandpa so they can fight villains with it. 

Hideaki Anno admits that Devilman and Mazinger Z were his biggest influences for Neon Genesis Evangelion. In both anime series, the main protagonist must control a massive robot in order to defeat evil giant monsters. They all deal with the same themes of transcending our humanity, overcoming self-doubt, and perseverance. They're also both action-packed anime. If you like one, you may enjoy the other. 

Both are new version of two classics animes from 70s years (neo human casshern and mazinger z). 

Well, if you're unaware already of what Robot Girls Z is parodying, I could always tell you to check out the original Mazinger Z series with 92 episodes, but I'm pretty sure that the lot of you are too spoiled to enjoy older anime. Instead, I can recommend you Shin Mazinger, a 2009 26 episodes anime reboot which is more faithful to the Mazinger mangas in more ways than one. Even if Robot Girls Z consist entirely of cute girls now, a simple fact remains, they're both hot blooded and fun as fuck for the entire family to enjoy!