What colour would the Fifth Doctor’s celery turn if he came into contact with dangerous gases? And, more importantly, does David Tennant know the answer? <\/p>
David Tennant is appearing on this week\u2019s episode of Rob Beckett\u2019s Smart TV, and is set to take part in a quiz all about, you guessed it, Doctor Who<\/a>.<\/p>\n The Tenth and Fourteenth Doctor star will be seen facing off against Josh Widdicombe, Roisin Conaty and Lydia West, and as seen in an exclusive clip for RadioTimes.com<\/a>, his first question relates to Peter Davison\u2019s Fifth Doctor<\/a>.<\/p>\n In the clip, Widdicombe is seen complaining that the question is about Tennant\u2019s own father-in-law, but Tennant points out that that would make it all the more embarrassing if he gets it wrong.<\/p>\n But just how does he fare? You can watch the clip right here now.<\/p>\n