An Oath Beyond Worlds (星を越えた誓い Hoshi o Koeta Chikai) is the seventh episode of Ultraman X. It features the debut of Ultraman X's Bemstar Armor.
Gargorgon was aiming at the Energy of Planet Gold which was hidden inside Rudian. During the fight of Ultraman X with Gargorgon, X was turned into a statue. Prince tE-rU is deeply regretting that because of the bullet that was aimed at him by Gargorgon, Ultraman X got defeated. Gargorgon tells humanity to surrender and send tE-rU to him. Now it's up to Xio to defeat Gargorgon, revive X and save humanity from the crisis.
Xio, UNVER, Rudian and X begin an all out attack on Gargorgon. When the destroyer is weakened, X tried to finish her with Eleking Armor's Eleking Electric Shock Wave but Gargorgon manages to withstand all attacks with ease. Soon Gargorgon fires the infamous petrification beam at Rudian but X takes the bullet and gets petrified instead. Before being fully petrified, Daichi manages to get a full scan on Gargorgon and finds something to send tto tE-rU: fear. Rudian and Gargorgon faints as the schoolgirl from earlier rushes to tE-rU's aid. tE-rU sees the girl resembles his younger sister at Planet Gold.
Gargorgon was detected on space, 400 m away from Earth and releases a broadcast: surrender to her superiority and give her tE-rU in 44 minutes, or else all lifeforms on Earth will be petrified. Minamikawa orders all UNVER branches to be prepare against Gargorgon's reign of terror. tE-rU leaves, but not before promising the schoolgirl to meet again later. Xio branches all across the world prepare to launch missiles but tE-rU stops them, since their actions will only strengthen Gargorgon's might, but his efforts were too late: Gargorgon effortlessly absorbs all incoming missiles from its singular hidden eye. tE-rU provides himself to act as a bait and together with Xio, they hatches a plan to destroy Gargorgon's eye and restore X.
The plan comes in motion, as tE-rU and Rudian shows up, Gargorgon appears to munch on the energies of Planet Gold from it. But while Xio members prepare to shoot, the tyrant absorbs Rudian's energy directly and petrify tE-rU. However, he ignores his own fate and orders Xio to attack and as they do so, X, tE-rU and Rudian are freed and they begin to fight Gargorgon. Before long her eye regenerates and With Cyber Bemstar card, X assumes Bemstar Armor and uses Bemstar Spout to redirect the petrification beam back to Gargorgon allowing Rudian to destroy it. Everyone celebrates and Minamikawa reconciles with Kamiki, praising him for having a good team to be managed. tE-rU learns the schoolgirl's name as Yuuki and gives her his necklace before departing. Daichi swears that one day, Earth and Gold will be united in spirit.
Daichi's Monster Lab
- Daichi: Daichi's Monster Lab. Today's monster is...
- X Devizer: Analyzing, Gargorgon.
- Daichi: The Petrification Demon Beast Gargorgon, able to turn X into stone with its Petrification Ray, its a dangerous monster.
- X: We were able to use the Cyber Bemstar card to turn the tables on it. Using the power of Bemstar Armor, we reflected the petrification ray and destroy Gargorgon.
- Daichi and X: Well, see you next time!
- Daichi Ozora (大空大地 Ōzora Daichi): Kensuke Takahashi (高橋健介 Takahashi Kensuke)
- Asuna Yamase (山瀬アスナ Yamase Asuna): Akane Sakanoue (坂ノ上茜 Sakanōe Akane)
- Wataru Kazama (風間ワタル Kazama Wataru): Yoshihiko Hosoda (細田よしひこ Hosoda Yoshihiko)
- Hayato Kijima (貴島ハヤト Kijima Hayato): Ukyou Matsumoto (松本享恭 Matsumoto Ukyou)
- Mamoru Mikazuki (三日月マモル Mikazuki Mamoru): Hayato Harada (原田隼人 Harada Hayato)
- Rui Takada (高田ルイ Takada Rui): Haruka Momokawa (百川晴香 Momokawa Haruka)
- Takeru Yamagishi (山岸タケル Yamagishi Takeru): TAKERU
- Chiaki Matsudo (松戸チアキ Matsudo Chiaki): Chiaki Seshimo (瀬下千晶 Seshimo Chiaki)
- Sayuri Tachibana (橘さゆり Tachibana Sayuri): Sarara Tsukifune (月船さらら Tsukifune Sarara)
- Shotaro Kamiki (神木正太郎 Kamiki Shōtarō): Yuu Kamio (神尾 佑 Kamio Yū)
- Ultraman X (ウルトラマンエックス Urutoraman Ekkusu Voice): Yuichi Nakamura (中村悠一 Nakamura Yūichi)
- Ultraman X (ウルトラマンエックス Urutoraman Ekkusu Suit Actor): Sakaekei Iwata (岩田栄慶 Iwata Eikei)
- Alien Fanton Gourman (ファントン星人グルマン Fanton Seijin Gourman Voice): Yasunori Matsumoto (松本保典 Matsumoto Yasunori)
- Alien Fanton Gourman (ファントン星人グルマン Fanton Seijin Gourman Suit Actor): Hiroyuki Fukushima (福島弘之 Fukushima Hiroyuki)
- Alien Gold tE-rU (ゴールド星人tE・rU Gōrudo Seijin Teru): Masaya Kikawada (黄川田 将也 Kikawada Masaya)
- Rudian (ルディアン Rudian Suit Actor): Hiroyuki Arai (新井宏幸 Arai Hiroyuki)
- Gargorgon (ガーゴルゴン Gāgorugon Voice): Jenya (ジェーニャ )
- Gargorgon (ガーゴルゴン Gāgorugon Suit Actor): Akira Okabe (岡部 暁 Okabe Akira)
- Ultraman X
- Eleking Armor
- Bemstar Armor
- In the scene where Rudian is facing Gargorgon, the DeLorean Time Machine from the Back to the Future series can be seen abandoned on a road.