You know what’s ironic? The decision for who was going to play Sammy was made purely on the basis of seeing her in The Red Queen, long before I realized she was the same actress who’d been in Last Christmas.
3×02 The Bloody Countess: When the Doctor closed the dimensional rift under her companion’s childhood bed, it was gone forever. But once again, the TARDIS is pulled off-course, this time landing them in seventeenth century Hungary. What is the true secret behind the notorious Countess Elizabeth Bathory, and how is it connected to the paradoxical Sammy Lake?