Ep 12. Frontier in Space (4)

The Doctor and Jo Grant find themselves in the midst of a conflict between two superpowers, the Earth Federation and the Draconian Empire. The two sides are on the brink of war and tensions are high. The Doctor and Jo are accused of being spies by the Earth Federation and are taken into custody. They discover that the real culprits are a group of Ogrons, who are working for a third force in the conflict, attempting to provoke a war between the two major powers.

The Doctor and Jo are able to escape their captors and flee to the Draconian Empire where they secretly meet with the Draconian prince. The prince agrees to hear out the Doctor's theory that the Ogrons are behind the attacks and invites him to accompany him on a diplomatic mission to the Earth Federation. The Doctor and Jo agree to go along, hoping to prevent a war.

The mission is fraught with danger as the Ogrons continue to cause trouble and both sides are suspicious of each other. The Doctor and Jo work tirelessly to uncover the truth and prevent a war, but time is running out. With the help of the prince, they are able to track down the Ogrons and uncover their true motives.

In the end, the Doctor is able to prevent a war between the Earth Federation and the Draconian Empire and exposes the Ogron's true intentions. The Doctor and Jo return to the TARDIS, ready for their next adventure.