Subtitle: Sludge Monster (ヘドロ怪獣 Hedoro Kaijū)
Return of Ultraman
Zazahn was one of two aquatic monsters that rose from the depths of the ocean along with Takkong. The two monsters battled at once, smashing through nearby structures in Tokyo Bay. During the midst of their fight, a young man known as Hideki Go was killed while he was rescuing lives from the two monsters' destruction. Zazahn and Takkong continued their titanic war, until finally the battle ended with Zazahn being beaten to death by Takkong.
- Suit Actor: Eiichi Kikuchi.
- Zazahn's debut was coincidentally at the same time of the release of the Toho film, Godzilla vs. Hedorah. This is most likely done to propagate the serious pollution crisis that was plagueing Japan at the time of the episode's airing.
- Curiously, Hedorah and Zazahn bear a close resemblance to each other, although Zazahn appears to be made of plants while Hedorah's texture is vaguely plant-like instead.
- In planning stages, Zazhan's name was Hedra.
- Zazhan's suit was originally produced by the Toho Special Art Department, but was too hard to move around in and so Kaisei Production remade certain aspects to free it up.
- Advertisements before the show's airing detailed Zazahn as Seaweed Monster (海草怪獣 Kaisō Kaijū).
- Although not physically seen, Zazahn is one of the monsters that makes up Belyudra's left arm in Mega Monster Battle: Ultra Galaxy Legends The Movie.
- Zazahn may have inspired The☆Ultraman Kaiju Red Smogy.
- Height: 50 m
- Weight: 12,000 t
- Origin: Tokyo Bay
- Powers and Weapons
- Adept Swimmer: Being completely composed of seaweed, Zazahn is fully capable even if underwater.
- Mist: Zazahn could fire out a stream of mist from his mouth as seen in a picture book. This power was unused in the show however.
Return of Ultraman
|Return of Ultraman Kaiju|
|Takkong | Zazahn | Arstron | Sadola | Detton | Kingsaurus III | Gudon | Twin Tail | Gorbagos | Ghostron | Dangar | Stegon | Mognezun | Shugaron | Seamons | Seagorath | Eledortus | Terochilus | Bemstar | Sartan | Magnedon | Beacon | Gokinezula | Zanika | Vacuumon | Kupukupu | Kingstron | Zagoras | Nokogilin | Gronken | Varricane | Yadokarin | Oxter | Plooma | Alien Zelan | King Maimai | Alien Mates | Muruchi | Leogon | Pris-Ma | Draculas | Re-Seagorath | Re-Bemstar | Black King | Alien Nackle | Alien Varduck | Alien Black | Snowgon | Alien Baltan. Jr | Builgamo | Alien Stora | Paragon | Alien Grotes | Kodaigon | Granadas | Alien Centaurus | Robonez | Alien Cygnus-61 | Alien Messie | Alien Zoole | Red Killer | Femigon | Yametaranese | Sasahiller | Alien Ateria | Alien Mysteler | King Bockle | Alien Bat | Zetton II|