[Androzani84]

Well, there’s a lot to explain reference wise. Not least that Gauma’s blurry flashback is actually footage from an episode of the OG Gridman, entitled “The Legend of Dragon”.

To explain the plot of that episode, and how it relates here, said episode revolves around a 5000 year-old Chinese mummy being brought into the local museum, with a legend stating that he was separated from his lover, a Princess. The bad guys think this will mean he has a lot of pent up rage and send the monster Mecha-Baguila into the museum’s CAT scanner, reprogramming it to revive the mummy and send it on a rampage. But the kids trapped in the museum realise that the mummy isn’t angry, he’s sad that he didn’t get to reunite with his lover (who one of them just happens to resemble). Meanwhile, Gridman fights Mecha-Baguila and gets help in the form of a new Assist Program modelled after the sarcophagus the mummy came in, Dyna Fighter, which can transform into the Dragon Cannon, allowing him to win.

And other things to note about this episode include:

When the subs came out, Funi mistranslated “mummy” (mirraa) as “mirror”. Though that’s been corrected since, any third party sites you may or may not watch still have the original preserved in all its glory.

Shizuma’s monster form actually appears briefly in the opening credits, during the shots of the Eugenicists. But it’s zoomed in so far you can’t tell what it is until this point.