When the TARDIS lands in New York in 1921 the Doctor takes the opportunity to introduce Leela to one of the foremost women of the age - the great Marie Curie, visiting America to be celebrated for her work.
Young Amelia Pond is sent to counseling. But her new therapist is rather unconventional. Because Missy is also in trouble. Stuck on Earth, she's targeted one of the Doctor's best friends to get his attention - but her timing's off.