Hideaki Anno's Return of Ultraman was a fan film part of Daicon Films in 1983
This is a reupload from AnnoCinema on Youtube both for more preservation but mainly for many own Ultraman Collection, idango (@wantstobeapanda on Twitter) did the translations
If you want more info on Daicon and Return of Ultraman go to Blunova on Youtube (https://www.youtube.com/watch?v=XsgLOKRmgs0&t)