Ep 6. The Doctor's Daughter

The Doctor's Daughter is the seventh episode of the fourth season of Doctor Who, which aired in 2008. The episode follows the adventures of the Tenth Doctor, played by David Tennant, his companion Martha Jones, and a soldier named Ross Jenkins as they find themselves on the planet Messaline. The planet is embroiled in a civil war between two factions known as the Humans and the Hath.

As the Doctor and his companions try to make sense of the situation, they encounter a mysterious device called the Source that has the ability to create new life. In the midst of their exploration, they discover a hidden chamber where they come face-to-face with a clone of the Doctor himself, who was created using his DNA. The clone, who refers to herself as "Jenny," is quickly thrust into the middle of the conflict, as she possesses the ability to end the war and bring peace to the planet.

Though Jenny has the same face and mannerisms as the Doctor, they quickly discover that she has a different perspective on life and death. She has been trained as a soldier and is unafraid to take risks and make tough choices, something that the Doctor finds difficult to reconcile with his own pacifist beliefs. Despite this, the Doctor and Martha work with Jenny to find a way to end the war and create a peaceful resolution for the two sides, even as they face danger and betrayal from unexpected sources.

As the episode progresses, viewers are treated to a mix of intense action sequences and emotional moments as the Doctor wrestles with his own identity and purpose. The conflict on Messaline also takes a toll on all of the characters involved, including the soldiers on both sides who are forced to confront the reality of war and its consequences. In the end, the Doctor and his companions are left to ponder the ethical implications of creating life, as well as the cost of fighting for what is right.

Overall, The Doctor's Daughter is a compelling episode that explores themes of conflict, identity, and morality. David Tennant delivers a standout performance as both the Doctor and his clone, Jenny, and the supporting cast provides plenty of drama and suspense as the story unfolds. Whether you're a long-time fan of Doctor Who or a newcomer to the series, this episode is a must-watch for its emotional depth and thought-provoking storytelling.