With that general introduction out of the way let's tackle the first subject for a new "segment" I am calling Diagnosis: Filler; sorry, no Dick Van Dyke to be found here.
I've mentioned this before, but when Masami Kurumada started conceiving of Saint Seiya in the mid-80s, following the (initial) harsh failure of Otoko Zaka, his goal was to aim precisely at a mainstream audience. The end result of this focus was that Saint Seiya was licensed out pretty much instantly (possibly even before the manga itself actually debuted, considering the speed), with Toei Animation getting the rights to produce an anime adaptation & Bandai getting the rights to produce toys. Because of this the Saint Seiya TV anime debuted in Japan on October 11, 1986, only about 10 months after the manga had debuted; still not quite as fast as Tottemo! Luckyman getting its TV anime only eight months after debuting, though. Because of this speed the anime had to rely on a decent amount of "filler" early on, including seeing Seiya & his friends take on a variety of anime-original foes that only appeared for an episode or two, as well as the introduction of the infamous Steel Saints, anime-original allies that were shoehorned into manga-adapted plot; however, all of this also meant that Bandai had more toys to sell! Still, once the story moved over to the battles with the Gold Saints after 40 episodes there really wasn't much that could be done in regards to "filler", outside of a couple of episodes here & there.
By the time the Sanctuary Chapter ended with Episode 73 on April 16, 1988 the Seiya manga was still in the midst of its second story arc, the Poseidon Chapter. Also, the climax of the Sanctuary Chapter resulted in a massive ratings boost for the Seiya anime, with Episode 73 achieving a series high of 20.6, after the battles with the Gold Saints started with a 7.1 for Episode 41; to clarify, most TV anime nowadays wish they could hit the 7s, which only Sazae-san ever surpasses. Therefore, with the next manga story arc still in production & an anime that was super hot, plus Bandai still wanted to sell more toys, it only made sense that Toei would embark on a large-scale filler arc for Saint Seiya. The end result was that Episodes 74 to 99 would tell the story of the Asgard Chapter, something that would only ever be experienced via the anime (though there was later a Chinese doujin manga adaptation) & the end of which would even tie into the start of the anime's eventual adaptation of the Poseidon Chapter, which began with Episode 100 on November 19, 1988. While the Asgard Chapter naturally wouldn't be able to maintain the ratings high that it was starting with, dropping all the way down to the high 4s before returning back to the 6s (the anime itself would end after 114 episodes in the 7s), this filler arc is actually generally well regarded by hardcore Seiya fans & used to often be cited as an example of a "filler arc done right". It would eventually be included in some Saint Seiya video games, alongside the actual manga arcs, & in 2015 would even get a sequel-of-sorts with Saint Seiya: Soul of Gold, a spin-off anime where the Gold Saints fought a new battle in Asgard during the tail end of the Hades Chapter. Due to Saint Seiya's notoriously poor track record in "North of Mexico" the Asgard Chapter (as well as the anime's version of the Poseidon Chapter) wouldn't get an official English translation until April of 2020, when Netflix added both arcs to its stream of the Seiya anime, continuing the brand new English dub produced by Toei & Sentai Studios; Netflix would eventually remove all of Seiya TV, but it'd later get added to Crunchyroll.
As this isn't a "traditional" review I won't be covering the Sentai Studios dub, though I've generally only heard good things about it, but I think it's time that I finally watch the Asgard Chapter myself & see if it still holds up as a seemingly shining example of how filler arcs should be done.