Liam Dryden is a Scottish internet personality, actor, and musician. He is best known as a part of the band Chameleon Circuit, whose music is entirely inspired by BBC television series Doctor Who; as Kairan "Kai" Fisher in sci-fi webseries Chronicles of Syntax; and as an organizer of Summer in the City, the UK's largest YouTube community event. Collectively, his YouTube videos have surpassed 8 million views.