The Lawless Monster Zone (怪獣無法地帯 Kaijū Muhō Chitai) is the eighth episode of Ultraman. Its original title in Japan is The Wild Monster Zone.
A group of scientists are sent to explore a new volcanic island. Months pass with no signal from them, that's when the Science Patrol is sent to investigate and rescue any survivors. What they find is like nothing anyone ever expected, the island is populated by huge monsters (Red King, Chandora and Magular) and all but one of the scientists have been killed. While most creatures within the expedition to the Lawless Monster Zone were vicious, Pigmon was not. It helped the injured sole survivor by giving him food, and led the Science Patrol to him when they arrived on the island. The reason for the monster's appearance is that the magnetic field on the island is off-balance, causing creatures to mutate. The island was later named "Tatara Island".
Two giant monsters were seen fighting called Red King and Chandora. Once Red King defeated Chandora by tearing off a limb/wing and throwing the dismembered limb, as well as some rocks, at him as the monster fled, and was never seen or heard from again. Mauglar, a burrowing monster, apparently survived the episode almost unnoticed, but was eventually killed by the Science Patrol. Red King killed Pigmon by creating an avalanche of rocks. Shin Hayata transforms into Ultraman to fight the monster. Once Ultraman appeared, Red King was defeated without the need for the Specium Ray (Except for when Ultraman used it on a rock Red King was about to throw at him). After being thrown around a few times, Red King was paralyzed. The SSSP had a moment of silence for the scientists and Pigmon, before leaving the island.
- Toshio Muramatsu (ムラマツ・トシオ Muramatsu Toshio): Akiji Kobayashi (小林 昭二 Kobayashi Akiji)
- Shin Hayata (ハヤタ シン Hayata Shin): Susumu Kurobe (黒部 進 Kurobe Susumu)
- Akiko Fuji (フジ アキコ Fuji Akiko): Hiroko Sakurai (櫻井 浩子 Sakurai Hiroko)
- Daisuke Arashi (アラシ・ダイスケ Arashi Daisuke): Sandayū Dokumamushi (毒蝮 三太夫 Dokumamushi Sandayū)
- Mitsuhiro Ide (イデ・ミツヒロ Ide Mitsuhiro): Masanari Nihei (二平 政成 Nihei Masanari)
- Isamu Hoshino (ホシノ・イサム Hoshino Isamu): Akihide Tsuwaza (津沢 彰秀 Tsuzawa Akihide)
- Ultraman (ウルトラマン Urutoraman): Masao Nakasone (中曽根雅夫 Nakasone Masao) (grunts)
- Narrator (ナレーター Nareta): Koji Ishizaka (石坂浩二 Ishizaka Koji)
- Ultraman Volume 2 features episodes 5-8.
- The US DVD Release Ultraman Here He Comes From the Sky features episodes 1-10.
- This episode was later featured in New Ultraman Retsuden episode 131 "The Lawless Monster Zone! Fight, Ultraman!."
- The Ultraman Orb episode, "The Dark King's Blessing," is a tribute to this episode.