Konstadinos "Dinos" Sfyris was a contestant in Series 57.
The following year, Sfyris returned to the Countdown world for the unofficial COLIN 2008 tournament. He subsequently appeared at CoNot 2008, CoLei 2008, COLIN 2009, CoLei2, COLIN 2010, CoLei Summer Special, CoLei3, Co:Lon 2011, COLIN 2012 and was the winner of CoNot 2009.
On both 16 December 2009, during a semi-final, and 15 March 2010 during a special, Sfyris was seen on the show again, as the audience member who solved the conundrum when neither contestant could get it. He appeared in another special on 2 August 2010, where he beat Series 59 octochamp Kai Laddiman, this time appearing as Dinos, as opposed to Konstadinos.
Outside of Countdown, Sfyris also appeared on The Weakest Link in 2009, and The Krypton Factor on 2 February 2010. One year later, he appeared on The Chase and Pointless, and then in January 2015 appeared on Tipping Point, followed by an appearance on Two Tribes later that same year.
|#||Date||Type||Contestant 1||Score||Contestant 2||Guest||Lex||Max|
|4457||11/10/2007||P||John Scott||57 – 99||Konstadinos Sfyris||Rick Wakeman||Susie Dent||121|
|4458||12/10/2007||P||Konstadinos Sfyris||86 – 42||Georgina Parkinson||Rick Wakeman||Susie Dent||115|
|4459||15/10/2007||P||Konstadinos Sfyris||87 – 48||Marianne Rowntree||Johnny Ball||Susie Dent||122|
|4460||16/10/2007||P||Konstadinos Sfyris||76 – 78||Dorian Lidell||Johnny Ball||Susie Dent||120|
|S28||2/08/2010||S||Kai Laddiman||84 – 90||Dinos Sfyris||Gary Osborne||Susie Dent||141|