I also put a number of them on YouTube, unlisted of course, I tried uploading all of them to YouTube but the ones in this playlist were the only ones not geoblocked worldwide by Toei. Of course these eps are only geoblocked in Holy See (Vatican City State), Italy & San Marino and the Content ID claim is by "Yam112003 Endemol" but at least they're viewable on YT: www.youtube.com/playlist?list=PL-eTK1JuIi0IaxXfURrkHeDPkZgwP-OoB
As for disc 4, that disc contains an anime "movie" completely unrelated to Mazinger Z but it was included in the DVD set from iOffer so I'm just gonna include it anyway. The "movie" is called Shadow World, and is actually 5 episodes of a anime series dubbed in English and spliced together. The anime is called "UFO Warrior Dai Apolon" (Japanese: UFO戦士ダイアポロン", also called "UFO Senshi Dai Apolon", "UFO Soldier Dai Apolon", "UFO Robo Dai Apolon" & "Dai Apolon". The dubbed "movie" was released in 1983 in the USA on VHS. On the DVD, the movie is split into 3 separate vids, with the opening and closing credits split from the rest of the movie. I uploaded the movie on YouTube with the opening & closing credits spliced in, but also uploaded those separately:
OMG Thank you so much! With this all 37 known episodes are complete! You are a legend! Now if only I could remaster the video in 4K and the audio into HD stereo...