Respond, Max (マックス号応答せよ Makkusu-gō ōtō Seyo) is the fourth episode of Ultraseven.
Three members of the UG are sent to a secret meeting with Commander Takenaka aboard the Max, one of the elite vessels in the Ultra Guard. This secret mission is to learn of the origin of several oceanic disappearances. Meanwhile, Moroboshi's Ultra Eye is stolen after he stops to help a woman on the side of an empty highway. Meanwhile at sea, the Max is lifted out of the ocean and carried into space by a red cloud. Dan and Capt. Kiriyama search miles of ocean while Furuhashi heads for space in the Ultra Hawk #2 for any signs of The Max. He finds the enormous vessel floating in space as well as evil aliens known as the Godorians who plan to take over the Earth.
- Dan Moroboshi/Ultraseven (モロボシ・ダン／ウルトラセブン（声） Moroboshi Dan/Urutorasebun): Kohji Moritsugu (森次 晃嗣 Moritsugu Kōji)
- Anne Yuri (友里アンヌ Yuri Annu): Yuriko Hishimi (ひし美 ゆり子 Hishimi Yuriko)
- Shigeru Furuhashi (フルハシ・シゲル隊員 Furuhashi Shigeru): Sandayū Dokumamushi (毒蝮 三太夫 Dokumamushi Sandayū)
- Kaoru Kiriyama (キリヤマ・カオル Kiriyama Kaoru): Shoji Nakayama (中山昭二 Nakayama Shōji)
- Soga (ソガ Soga): Shinsuke Achiha (阿知波信介 Achiha Shinuske)
- Amagi (アマギ Amagi): Bin Furuya (古谷敏 Furuya Bin)
- Narrator (ナレーター Narētā): Hikaru Urano (浦野光 Urano Hikaru)
- Ultraseven (ウルトラセブン Urutorasebun): Koji Uenishi (上西弘次 Hirotsugu Uenishi)
- Ultraseven Volume 1 features Episodes 1-4.
- This episode was later featured in New Ultraman Retsuden episode 19 "Max, Acknowledge! Seven vs. Alien Godola."