Mighty Gross (マイティグロース Maiti Gurōsu) is a monster creation of Mad Go-Ne that appeared in the series Jumborg Ace.
Subtitle: Cyborg Dinosaur (サイボーグ恐竜 Saibōgu kyōryū)
- Length: 90 m
- Weight: 39,000 t
- Origin: The Foot of Mt. Chichibu
Mighty Gross was sent by Mad Go-Ne on a mission to destroy PAT's base. He almost succeeded until Jumborg Ace appeared. Fighting Jumborg Ace, he was eventually decapitated by the Heading Killer.
- Powers and Weapons
- Missiles: Mighty Gross can launch missiles from his face.
- Suction: He can suck objects like his enemies' arms into barnacle-like holes on his body.
- His roar is a modified Red King roar.
- Design: Yoshiaki Yoneya
- Design motifs are Apatosaurus (its shape) and barnacles (its back).
- Mighty Gross' ghost would appear in the monster graveyard fighting Jumborg Ace while Wutan attacks Earth.
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