This week's comment challenge is to write a story about meeting one of your ancestors!

Tell us a story about travelling back in time with the Doctor and meeting an ancestor.

Leave us a comment and we'll feature a selection of stories on our profile. Some thought starters:

- What time period do you travel to?

- Who is the ancestor you meet and how are you related to them?

- Describe what you would say to them or ask them!

Submit your stories by Friday 16th November at 11:59 GMT.

The seventh episode of the new series entitled Kerblam! will air Sunday 18th November!

And, if you missed Demons of the Punjab or would like to watch it again, you can catch up with the current series On Demand at BBC iPlayer (UK) or BBC America (US). For other regions, visit doctorwho.tv/watch to find out where to catch up in your territory.