Martha Jones

Martha is a medical student, sharp and quick under pressure, when a hospital inexplicably lands on the moon and she meets the Doctor amid the chaos. She keeps her head, helps solve the crisis, and earns an invitation to travel through time and space—stepping into a life far stranger than the one she trained for.

Freema Agyeman gives Martha a steady, competent warmth that never tips into deference; she's curious about the universe but not dazzled into silence. The writing lets her be the smartest person in the room without making a fuss of it, and her unrequited feelings for the Doctor are handled with dignity rather than pathos.