User blog:Lamango/Ultra Kaiju cameos in Godzilla vs Gigan

I was watching Godzilla vs Gigan and just noticed this.

In the center of the frame, you can see Red King, Gomora, Dancan, Bemlar, Twin tail and several other Ultra Kaiju. Is...Is Ultraman a thing in the Godzilla universe? Like... Is it a tv show/manga? Just like Gamera and Godzilla were things enough in the Ultraman universe to warrant toys?