Stardate 4040.7: The S.S. Beagle, missing for six years, is found as debris near Planet IV of System 982. Kirk, Spock, and McCoy beam down to the planet to investigate and find a ragged group of fugitive slaves trying to stay hidden from the police. These "sun worshippers" distrust the landing party but soon discover that they are not a threat. Kirk informs them that he is looking for another group of strangers led by a man named Merik. Merikus is the First Citizen of the Empire, but Kirk is not sure if it is the same man. Pursuaded to help them find Merik and his crew, the leader of the fugitives sends Flavius, an ex-gladiator, to be their guide. The landing party, however, is soon captured and led into the city where they discover a civilization much like 20th century Earth, but culturally similar to ancient Rome. The landing party find Merik, now First Citizen Merikus, who six years ago abandoned his ship and beamed his crew down to the planet. Those who could adapt survived, and th

The Doctor, Jamie and Victoria arrive at an outpost drilling for natural gas in the North Sea. Mysterious heartbeat sounds are echoing through the pipes, there have been drops in pressure, and contact has been lost with several offshore rigs. Victoria is attacked by a monstrous form of living seaweed, and some of the base personnel are possessed by the poisonous Weed, which stings them and draws them under its control. As the Weed steps up its attack on the base, the Doctor discovers that it's vulnerable to high-frequency sounds, and drives it off with the help of Victoria's screams - amplified by his trusty new invention, the sonic screwdriver. However, Victoria has had enough, and she chooses to remain on Earth, albeit a century after her own time.