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Because his name is Ben Tennyson and he can transform into 10 different aliens.
But now he can turn into like many more aliens, about 1 million but only about 50 are mentioned in the show. The Ultimatrix and omnitrix scan a foreign DNA that is not in the Codon Stream therefore saving it and using it for future transformations.
Wiki User
∙ 11y ago
Wiki User
∙ 9y agofirst Ben has 10 aliens, his last name is Tennyson and the whole Ben ten rhyming thing going on plus he is 10 years old...thus Ben 10 (catchy right)
Wiki User
∙ 14y agoBecause he is called Ben Tennyson and the omnitrix has 10 default aliens on it
Wiki User
∙ 11y agoflashback
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