Edward Thomas, head of the team responsible for Doctor Who's amazing production design, will be the special guest of BBC Radio Wales.
Edward will be joining host Mair Davies to answer your questions from a little after 1.30pm to 2pm today. You can phone in your questions on 03700 100 110, text them to 81012 or email firstname.lastname@example.org.
Calling BBC Radio Wales will now cost you no more than dialling numbers starting 01 and 02. Also, calls to us will be included in your discount packages on both landlines and mobiles.
You can listen live online, or listen again on the BBC iPlayer. The show will be kept online for seven days after broadcast.