The band saw off competition from Pippa the Ripper, Anastasia Volandas, Matthew Crane, Gypsy and Kimberley Dayle.
Orkian came through in a fierce afternoon heat.
The final will occur at 4pm today.
Hosted by Event magazine editor Jeremy King, the Next Big Thing involves acts competing for a £1,000 cash prize and contract courtesy of entertainment agency Sternberg Clarke.
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