Hopefully someone knows this show

Ok. I generally have problems with the way my memory behaves. So lately I’ve been thinking of this old tv show I watched when I was a kid. I only remember brief bits of it so bare with me. The show was about a guy who had a base in a mountain somewhere. This guy had a special ring that gave him powers. However, he could only keep this ring on for a certain amount of time or he died I believe. He had a cool flying machine, and could grow to be really huge. (Kinda like the indian guy from super friends) I believe the last episode he fought godzilla and lost.

I’ve recently moved to China for study and saw a little action figure. The image looked a lot how I remember the character. I believe the box said Megaman on it but I’m not sure. I tried searching megaman and only get capcom’s creation. So I’m not sure if this is actually the name of the show or if I just can’t read. I was in a hurry at the time.

I was wondering if anyone out there remembers this show and could help end my curiosity. It was something I watched over 15 years ago. So it’s kinda old.

Ultraman. Close enough I suppose. A lot older than I thought it was.