General Trivia

As mentioned on the main page, it was created for the Super Robot Wars series as a Mazinger equivalent to Shin Getter Robo. In its debut in F Final, it was literally Mazinger Z evolved through the Getter Rays. In the entire Super Robot Wars Alpha saga, it was changed to be the Super Prototype Mazinger (the inverse of the later OVA, where it was the final Mazinger). The actual Mazinkaiser OVA would eventually debut in Super Robot Wars GC, with Super Robot Wars Judgment, Super Robot Wars W, and Super Robot Wars L including both it and the Great General of Darkness sequel. The original OVA also was included in Super Robot Wars X-Ω and Super Robot Wars DD.
In a twist for Super Robot Wars X, the original Mazinkaiser from F Final makes an appearance, albeit used by the Shin Mazinger version of Kouji Kabuto. This game also features the "Mazin Emperor G", the Great Mazinger "successor" created specifically from Super Robot Wars V; within the story, both are used as a deterrent against the Mazinger ZERO, complete with the Mazinkaiser and Mazin Emperor G performing the newly created "Majin Soukougeki" on the latter.
Super Robot Wars DD is notable for giving the OVA version of Mazinger Z the Jet Scrander, a concept not featured in the source material proper. Also, the OVA version of Tetsuya gets to pilot "Mazin Emperor G."

Tropes

Dawson Casting: Hiroya Ishimaru was 60 years old when he voiced 17 year old Koji Kabuto in Mazinkaiser.
Late Export for You: Latin America didn't get these OVAs until 2021, basically two decades after it was released in Japan.
No Export for You: Subverted; this was literally the only Mazinger Animated Adaptation to cross the Pacific uncut until Discotek licensed the original Mazinger Z and available quite cheaply packaged with Shuten Doji.
Role Reprise:
- Hiroya Ishimaru, Hidekatsu Shibata, Haruko Kitahama and Kosei Tomita reprised their roles as Koji Kabuto, male and female Baron Ashura and Dr. Hell respectively from the original TV series.
- In the Latin American Spanish dub, the entire dub cast from both the remasterized version of the TV series and Mazinger Z: Infinity reprise their roles here.
The Other Darrin: The Discotek Media/Kocha Sound dub of Mazinkaiser vs. The Great General of Darkness recast everyone from the OVA, understandable seeing as most of ADV's Austin pool doesn't really voice act anymore