I didn’t know they were on blu, honestly. I have some old “Goodtimes” DVDs (which I later discovered to have altered sound effects) and I downloaded them all from Internet Archive because I have a flash drive that looks like Superman, so I figured it’d be poetic to have them there. The Internet archive versions are pretty low quality, but unaltered AFAIK.
Are there actual HD masters? Or are the ones on the Blu-rays just upscale SD?