|Home world:||Yapool's dimension|
|First appearance:||Ultraman Ace Episode 20: "The Star of Youth, The Star of a Couple Zemistiar."|
Subtitle: Large Cicada Super-beast (大蝉超獣 Dai Semi Chōjū?)
- Height: 63 m
- Weight: 56,000 t
- Origin: Yapool dimension → Suruga Bay
Another of Yapool's bizarre creations, Zemistlar was assigned to destroy a certain ship. It was going to bring peace to Earth and Hokuto witnessed the ship flying so Yapool decided to summon the choju Zemistlar! Zemistlar went on a rampage and TAC was quick to assess the situation. TAC fired on Zemistlar but the choju was persistant and kept on his way to the ship called Scandinavia. The ship's designer decided to cut the chains of the vessel and make it set sail on its own and won't stand its destruction. Before Zemistlar could destroy the ship, Minami broke the choju's concentration while he's using telepathy. Hokuto and Minami becam Ultraman Ace and battled Zemistlar. Zemistlar proved to be a tough fighter and used telepathy on Ace, weakening him. Scandinavia's chains were set loose and the choju fell victim to Ultraman Ace's Metallium Ray.
- Zemistlar's roar is a modified Goldon roar.
Powers and Weapons
- Fire Stream: Zemistlar can spew fire from his mouth.
|Ultraman Ace Kaiju & Seijin|
|Verokron | Yapool | Chameleking | Vakishim | Garan | Aribunta | Giron Man | Brocken | Alien Metron.Jr | Doragory | Muruchi II | Gammas | Zaigon | Alien Antira | Unitang | Sabotendar | Barabas | Ace Killer | King Crab | Cattle God | Cowra | She-Devil | Hotarunga | Black Pigeon | Android Couple | King Kappa | Zemistlar | Aprasar | Aprasar Fairy | Space Mask | Black Satan | Giant Yapool | Mazaron Man | Yojo | Mazarius | Alien Orion | Sphinx | Alien Hipporito | Lunaticks | Undergroundmon | Gitagitanga | Red Jack | Baktari | Coakes | Bad Baalon | Kaiteigagan | Dreamgillas | Soundgillar | Machless | Snowgiran | Namahage | Alien Fire | Firemons | Alien Steal | Kaimanda | Shishigoran | Iceron | Woo II | Fubigirara | Onidevil | Gasegon | Daidarahoshi | Hanzagiran | Verokron II | Yapool Woman | Univerlages | Aquarius | Alien Revole | Signalion | Geegon | Alien Simon | Jumbo King|