And I must take it back to the stars. DOCTOR: It's the Mandragora Helix. It got into the TARDIS. Sarah? The curfew.
Plan: A: Sarah; Q: Who is the Doctor's companion in this episode? A: the Mandragora Helix; Q: What is the name of the entity that transports the TARDIS to 15th century Italy? A: the stars; Q: The Mandragora Helix exists among what? Summary: The Doctor and Sarah are drawn into the Mandragora Helix, an entity which exists among the stars and which transports the TARDIS to 15th century Italy.