Amalgam Alien, Ben 10 Wiki

Amalgam Alien is a form Ben transforms into when he loses control of his emotions. Amalgam Alien's appearance is a mix of Four Arms, Heatblast, Diamondhead, Cannonbolt, Rath and Slapback. From what can be seen of his body, it appears like Rath's but with Cannonbolt's arms and underbelly. Around his neck is Rath's mouth that opens up to the Heatblast flame that surrounds his head. His head is that of Four Arms without his head stripe, and his two right eyes replaced by Slapback's eye and eyebrow.

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Ben 10 Reboot - Amalgam Ben by dlee1293847 on DeviantArt

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Mad Kevin 11 1st Amalgam Form by Onyx1327 on DeviantArt