Battle! Monsters vs. MAT (決戦! 怪獣対マット Kessen! Kaiju Tai Matu) is the sixth episode of Return of Ultraman.
Continuing from the previous episode, Ultraman briefly battles Gudon and Twin Tail before he is forced out of the fight after his Color Timer indicator expires. Thankfully, the two creatures -- one the natural predator of the other -- begin fighting one another, and end up taking their differences out to sea. The trapped civilians are rescued, but Aki is seriously injured. Go, angering his teammates once more, decides to stay at her side till she's well again. Meanwhile Gudon and Twin Tail surface once more and Tokyo is ordered to be evacuated.
- Hideki Go (郷 秀樹 Gō Hideki): Jiro Dan (団 時朗 Dan Jirō)
- Takeshi Minami (南猛 Minami Takeshi): Shunsuke Ikeda (池田 駿介 Ikeda Shunsuke)
- Ippei Ueno (上野一平 Uneo Ippei): Mitsui Hatashi
- Yuriko Oka (丘ユリ子 Oka Yuriko): Mika Katsuragi (桂木美加 Katauragi Mika)
- Katsushiro Kato (加藤勝一郎 ): Nobuo Tsukamoto (塚本信夫 Tsukamoto Nobuo)
- Fumio Kishida (岸田文夫 Kishida Fumo): Nishida Ken (西田健 Ken Nishida)
- Jiro Sakata (坂田 次郎 Sakata Jirō): Kawaguchi Hideki (川口英樹 Hideki Kawaguchi)
- Aki Sakata (坂田アキ Sakata Aki): Rumi Sakakibara (榊原るみ Sakakibara Rumi)
- Ken Sakata (坂田健 Sakata Ken): Shin Kishida (岸田 森 Kishida Shin)
Return of Ultraman Vol.2 Episodes 5-8.