It's time for a brand new Who's Round, Toby Hadoke's Doctor Who 50th anniversary quest to interview someone who's been involved with every single Doctor Who story. This time it's a special look at a lost Hartnell story...

It's a missing story that no one talks about much. Yet it has some great villains and a superb incidental score. And a companion leaves. As there will likely never be a DVD extra Making Of... of the story, Toby Hadoke's Who's Round has filled the gap. This time we hear from an actor who played a villainous role and we have a bonus conversation with another thesp who worked in this, possibly the least discussed story of all time.

Nominated charity: Helen & Douglas House - Children's Hospice

If you have any leads for Toby to help him reach his target, you can mail in on [email protected]