See if you can spot him in the Series 3 episode. No? Well, you must have blinked…
The Blink actress also reflects on how much she enjoys being part of the Doctor Who family.
“I hated the last scene so much that the morning after I emailed the script, I wrote a new ending.”
The new watchalong will take place at 19.00 (BST) on Saturday 31st October.
Doctor Who will know Louis best for playing an older Billy Shipton in Blink.
Carey Mulligan, who played Sally Sparrow in Blink (2007), was asked to be a companion to the Tenth Doctor – but