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Episode Four
It's Only a Theory - S1 - E4
The guest celebrity is broadcaster Clare Balding and the experts are Prof Geoff Beattie and Marcus Chown.
It's Only a Theory: Season 1 - 8 Episode s
1x1 - Episode One
October 6, 2009
The guest celebrity is sports presenter Clare Balding and the experts are Dr Aubrey de Grey and Lucy Beresford.
1x2 - Episode Two
October 14, 2009
Andy Hamilton, Reginald D Hunter and Martha Kearney decide if experts' theories are valid.
1x3 - Episode Three
October 25, 2009
The guest celebrity is broadcaster Kirsty Wark and the experts are Dr David Bainbridge, Professor Chris Budd and Professor Stanley Wells.
1x4 - Episode Four
November 2, 2009
The guest celebrity is broadcaster Clare Balding and the experts are Prof Geoff Beattie and Marcus Chown.
1x5 - Episode Five
November 9, 2009
The guest celebrity is broadcaster Martha Kearney and the experts are Julian Richards and Dr Peter Thompson.
1x6 - Episode Six
November 10, 2009
The guest celebrity is Vince Cable MP and the experts are, once again, Dr David Bainbridge and Marcus Chown.
1x7 - Episode Seven
1x8 - Episode Eight
November 24, 2009
Clare Balding returns to the judge's chair, with experts David Ryan and Marcus Chown presenting the final theories of the series.