Queen Skithra (Anjli Mohindra).
Nikola Tesla (Goran Višnjic) joins the Doctor and her friends on a night train to New York.
The Doctor has always wanted to meet Nikola Tesla, the visionary genius who was sadly underappreciated in his own time. Unfortunately, she’s not his only fan – the scorpionlike Skithra are determined to kidnap Tesla and force him to work for them. The Doctor’s indignation at the Skithra for stealing technology seems a bit rich when she freely admits she twocked the TARDIS. Is something stirring in her subconscious to drive her anger with those who steal instead of creating?