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Published 08:47 1 Feb 2016 GMT
Updated 17:10 31 Jul 2016 BST
Since the show's finale, he played a few other parts, appearing in The Bill as Oliver Sinclair (Ollie) and in the pilot episode of BBC Three comedy Coming of Age. He also played Simon Cosgrove in the film About a Boy.
But you might not recognise him if you saw him walking down the street, even if you were a die-hard My Parents Are Aliens fan (which, based on the amount of nonsense we've seen online, probably exist somewhere).
Nowadays, Kew is a musician and he looks a bit different....
https://twitter.com/AlexKew/status/677118965185978369
https://twitter.com/AlexKew/status/677494609732354049
https://twitter.com/AlexKew/status/685197075210973184
We'd never have guessed it was him unless someone told us.
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