The 10:00 AM Monster Bird (午前10時の怪鳥 Gozen Jū-ji no Kaichō) is the twentieth episode of Ultraman Geed.
The bird-like monster Gyeron repeatedly shows up in the same place at 10:00 AM no matter how many times it is defeated. Everyone works together to figure out how to put a stop to this.
Having battled against the Star Bem Gyeron, Riku remembers how it all happened:
On the first day of its appearance, Geed was simply using Acro Smasher's Smash Moon Healing to calm the monster before it departed. By the subsequent days it reappeared at 10:00 am as if nothing happened and Geed was forced to destroy it. AIB took this case as they examine the remnants of Gyeron but discovered its crystallized remains melted easily. By the fourth day, after Zero destroyed it, Moa found that its DNA matched the same individuals before, meaning that Gyeron somehow kept reviving itself.
Moa enlists the help of Riku and Laiha to collect Gyeron's remains around the city for incineration. On the fifth day, the destroyed remains from yesterday were still collected but all of them evaporate and reform into Star Bem Gyeron, including those that were incinerated. Geed assumed Royal Mega-Master and defeated it with Swing Sparkle.
Returning to the present, an exhausted Riku went for a walk to chill himself. Bumping into Moa, the two tracked one of Gyeron's life signals in Rumina's apartment, which quickly vanished. It was revealed to be Mayu's work, who had collected one of Gyeron's samples and froze it in hopes of preventing it from melting but failed. An idea hits Moa and the two left the scene.
According to RE.M.'s analysis, Gyeron's high body temperature resulted in the content of its body fluids. Freezing its essence can shut down the ability and Riku initially had the idea to bring said monster to Antarctica but RE.M. rejected it due to the body weight. Moa suggests that once Gyeron destroyed, the remains would be collected immediately and a recently arrived Leito gives an idea.
On the sixth day, the battle resumed as usual but Zero Beyond expands a giant barrier around Geed and Gyeron, allowing the latter's essence to be scattered within limited area. Gathering the citizens of Hoshiyama, Riku and the others collect all of Gyeron's remains and had AIB froze them before being deported.
Kei on the other hand was revealed to have summoned Gyeron and obtains the analysis of Royal Mega-Master.
- Riku: Ultra Capsule Navi! Here are today's capsules!
- Riser: Luna Miracle Zero!
- RE.M.: Luna Miracle Zero. Height: 49 meters. Weight: 35,000 tons. A blue form for Zero where he uses the power of Cosmos and Dyna.
- Riku: Next up is this one!
- Riser: Arch Belial!
- RE.M.: The Great Galactic Emperor, Arch Belial. Height: 300 meters. Weight: 300,000 tons. Belial's colossal, savage, ultimate form.
- Riku: Be sure to watch next time!
- Riku Asakura (朝倉リク Asakura Riku)/Ultraman Geed (voice): Tatsuomi Hamada (濱田龍臣 Hamada Tatsuomi)
- Laiha Toba (鳥羽ライハ Toba Raiha): Chihiro Yamamoto (山本千尋 Yamamoto Chihiro)
- Moa Aizaki (愛崎モア Aizaki Moa): Mayu Hasegawa (長谷川眞優 Hasegawa Mayu)
- Leito Igaguri (伊賀栗レイト Igaguri Reito): Yuta Ozawa (小澤雄太 Ozawa Yūta)
- Kei Fukuide (伏井出ケイ Fukuide Kei): Kunito Watanabe (渡辺邦斗 Watanabe Kunito)
- Lumina Igaguri (伊賀栗ルミナ Igaguri Rumina): Hitomi Hasebe (長谷部瞳 Hasabe Hitomi)
- Mayu Igaguri (伊賀栗マユ Igaguri Mayu): Mirei Shimizu (清水美怜 Shimizu Mirei)
- Zena (ゼナ Zena): Hideyoshi Iwata (岩田栄慶 Iwata Hideyoshi)
- RE.M. (レム Remu Voice): Suzuko Mimori (三森すずこ Mimori Suzuko)
- Alien Pegassa Pega (ペガッサ星人ペガ Pegassa Seijin Pega Voice): Megumi Han (潘 めぐみ Han Megumi)
- Ultraman Zero (ウルトラマンゼロ Urutoraman Zero Voice): Mamoru Miyano (宮野真守 Miyano Mamoru)
- Alien Shadow Zena (シャドー星人ゼナShintaro Asanuma (浅沼晋太郎 Asanuma Shintarō) Voice):
- Arie Ishikari (石刈 アリエ Ishikari Arie): Ryoko Kobayashi (小林 涼子 Kobayashi Ryōko)
- Caster: Chisato Kawai (川合千里 Kawai Chisato)
- Megumi: Mie Kobayashi (小林美江 Kobayashi Mie)
- Yuka: Anri Mihama (末浜杏梨 Mihama Anri)
- Rekyum Man (レキューム人 Rekyūmu Jin Voice): Kenta Matsumoto (松本健太 Matsumoto Kenta)
- Ultraman Geed: Hideyoshi Iwata (岩田栄慶 Iwata Hideyoshi)
- Ultraman Zero: Akira Okabe (岡部暁 Okabe Akira)
- Pega: Satomi Maruta (丸田聡美 Maruta Satomi)
- Star Bem Gyeron: Kazunori Yokoo (横尾和則 Yokoo Kazunori)
- Rekyum Man: Hitomi Adachi (安達仁美 Adachi Hitomi)
- Geed pinning Star Bem Gyeron is similar to how Seven did as well, only that Seven finished him off while pinned.
- On each day, Gyeron is destroyed by a slash or slugger-like attack, mirroring his same demise in Ultraseven, only that he faces Geed and Zero, Geed who uses Seven in both a fusion and his attack in the King Sword, and Seven's Son, Zero.
- Gyeron facing off against Solid Burning pays homage to Seven and his fight with said Kaiju. The way of editing is also a nod to Seven as Metron and Alien Spell fought Seven; it would first show Seven or the Alien attacking, then freeze, the cut to different shots.
- Gyeron's first ever appearance was banned from viewing, but unlike Alien Spell, another monster who was banned cause reasons, Gyeron was allowed to make appearances outside his episode and he made it in stage shows. Spell and Gyeron are again from Seven.
- Gyeron meets his end just like his predecessor, a Slugger attack defeating him.
- Kei holding the Gyeron Capsule raises questions, it could have been Kei releasing Gyeron over and over every 24 hours at 10 (Because all capsules have a charge time of day) to learn Geed's abilities and powers.