Echo (こだま～谺～ Kodama) is the third episode of Ultraman Orb THE ORIGIN SAGA.
As the Suzark about to approach an asteroid, Micott managed to steer the jet away from it. After saving the Suzark from another asteroid, Orb charges towards Bemstar and successfully killed it. On Planet Juran, Musashi Haruno was contacted by Shin Asuka of a certain people trying to use monsters to create chaos and sought his help. The former complies and transform into Ultraman Cosmos while approaching the Stargate. On Earth, once the research team connects the seal fragment, they deduced that the illustration is in fact the Yggdrasil tree. As Shohei inspects the salvaged seed once more, it releases a backlash wave accompanied with memories of Amate. He awakens at a hospital and repeatedly sketches infinity symbol, followed by his own handprints on his bed. The examination led by his doctor believes that his brain has received something odd or a "parasite" has entered it. Meanwhile, Amate gets into another argument with Raigou over the best way to end their war with Psychi.
Back in the Suzark, Gai and Juggler hears the Kanon pilots' backgrounds and the former decided to join them to Planet Zain, much to Juggler's dismay. Hearing that Amate can turn giant, Gai is impressed with the Kanon queen being his "senior" but Micott told him that she is an exact opposite of him. While visiting Shohei's ward, Yui and Yusuke are shocked to discover him drawing the strange infinity symbol as images of Amate still floating in his mind with both people from faraway locations are able to be connected. Juggler tries to lecture Gai of the true nature of conflict through swordfight and once more detest his peaceful ideals. As Gai leaves, an impressed Micott approaches Juggler and sought apprenticeship in the Serpent-Hearted Way. Juggler refuses due to it being an obstacle for his mission but she senses his sorrow of being betrayed in a similar to Ricca, although the former admit that he is only betrayed by "himself".
Suddenly the ship was attacked by a fleet of Bezelbs while approaching Planet Zain. Gai transforms into Orb and eliminates the first fleet as he made his landing and fought nearby their hive. While another fleet attacks the Suzark, a strange light clears the path again and saved Orb from being injected, revealing to be Ultraman Dyna. But in addition to the newly arrived Ultra, an infected Birdon comes to aid the Bezelb group.
- Gai Kurenai (クレナイ・ガイ Kurenai Gai): Hideo Ishiguro (石黒 英雄 Ishiguro Hideo)
- Jugglus Juggler (ジャグラスジャグラー Jagurasu Jagurā): Takaya Aoyagi (青柳 尊哉 Aoyagi Takaya)
- Amate (アマテ Amate): Saki Fukuda (福田 沙紀 Fukuda Saki)
- Miccot (ミッコト Mikkoto): Ayane (文音 )
- Ricca (リッカ Rikka): Asuka Shibuya (渋谷 飛鳥 Shibuya Asuka)
- Shohei Moriwaki (森脇 翔平 Moriwaki Shōhei): Yasuhisa Furuhara (古原 靖久 Furuhara Yasuhisa)
- Yui Nishioka (西岡 結衣 Nishioka Yui): Karen Miyazaki (宮﨑 香蓮 Miyazaki Karen)
- Shinra (シンラ Shinra): Yasuyuki Maekawa (前川 泰之 Maekawa Yasuyuki)
- Raigo (ライゴウ Raigou): Takaaki Enoki (榎木 孝明 Enoki Takaaki)
- Psychi (サイキ Saiki): Motoya Izumi (和泉 元彌 Izumi Motoya)
- Bugen (ブゲン Bugen): Takeyuki Yue (湯江 健幸 Yue Takeyuki)
- Yosuke Aoi (青井 洋介 Aoi Yōsuke): Mister Chin (ミスターちん Misutā Chin)