Episode 11 of SSSS.Dynazenon outright confirms that Gauma is the same 5000 year old mummy from ep 18 of the 1993 Gridman series & even uses/references audio of Yuka from the very same episode. This also directly confirms that the SSSS series are sequels to the 1993 Tokusatsu series.
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MAG.MOE - The MAG, The MOE.