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Name - Chameleons
Species – Chameleon
Planet – Chameleon Planet
Temperament – Devious
Appearances – The Faceless Ones

An atomic explosion caused a genetic mutation, resulting in a race of faceless aliens threatened by extinction. These, the so-called "Chameleons", then launched a secret operation using holiday tours to kidnap humans, take them to a space station to steal their identities and, ultimately, their lives. They depended on black armbands (while their human "original" wore white ones) to maintain their human appearance after transference. They were ultimately exposed and defeated by the Doctor, who threatened to remove the white armbands from the humans kept at Gatwick Airport, and thereby doom the Chameleons. The Chameleons then agreed to release their prisoners and return to their planet. The Doctor gave them a formula for the solution to their problem