Ep 4. The Time Warrior, Ep. 4

The Time Warrior, Ep. 4 is the fourth and final episode of the "Sontarans" storyline in the first season of Doctor Who: Monsters. In this episode, the Doctor, a Time Lord who travels through time and space in his TARDIS, must stop the Sontarans, a war-loving alien race, from capturing a medieval English castle.

The Doctor arrives in the Middle Ages and meets a noblewoman, Lady Eleanor, who is desperate to save her castle from the advancing Sontarans. The Doctor agrees to help Lady Eleanor and they soon discover that the Sontarans are using time travel to try and change the course of history.

The Doctor and Lady Eleanor work together to devise a plan to stop the Sontarans, while the alien race prepares for a final battle. As the Sontarans make their way to the castle, the Doctor and Lady Eleanor use their knowledge of battle tactics to launch a surprise attack on their enemy.

In the midst of the battle, the Doctor discovers the true reason why the Sontarans are so intent on capturing the castle - they are searching for a powerful weapon that can destroy entire planets. The Doctor manages to destroy the weapon and defeat the Sontarans, saving Lady Eleanor and the castle.

As the episode draws to a close, the Doctor says his goodbyes to Lady Eleanor and the medieval time period, ready for his next adventure through time and space.

The Time Warrior, Ep. 4 is a thrilling conclusion to the Sontarans storyline, filled with action, suspense and a touch of medieval history. It showcases the Doctor's intelligence and quick thinking, as well as his willingness to help those in need. Overall, this episode is a must-watch for fans of Doctor Who and sci-fi/action enthusiasts alike.