A Chameleon took over the identity of Jamie McCrimmon during their attempted invasion of Earth in 1966.
History[]
The Chameleon Jamie had no Scottish accent, as the Second Doctor discovered when he mistook the Chameleon for the real Jamie.
"Jamie" manned the communications equipment, establishing contact between the Chameleons' space station and Gatwick Airport.
He was later shot and killed by the Chameleon Spencer. (TV: The Faceless Ones)