

Kassia informs it that Seron will enter rapport with the Keeper instead of Tremas, but Melkur is not concerned. When the band locks around Kassia's neck and glows red, Melkur commands her to go forth and be its eyes and ears. A band appears at Melkur's feet and he asks Kassia to wear it as a token of her allegiance, and she places it around her neck. In the Grove, Kassia is seen again conversing with Melkur. Meanwhile, Adric and Tremas's daughter Nyssa are conducting a Fourier analysis of the energy readings. The following day, Tremas and the Doctor go to the Grove to search for the TARDIS. Meanwhile, Kassia rushes to Melkur and starts hiding the bodies of the Fosters. Consul Seron says that should they breach any law, Tremas's life will also be forfeit. Tremas speaks up for the Doctor and Adric and invokes Consular privilege to protect them. Meanwhile, Melkur is seen attacking Fosters with lasers shooting from its eyes. Seeing Tremas's instrument, the Doctor says that he could use it to detect the high energy beam used to attack the Keeper. Kassia describes the Doctor and Adric as creatures of evil before becoming overwhelmed and fainting. The Consuls and the Fosters then point their weapons at the Doctor and Adric and close in on them. Evil, infinite evil!" The Keeper then vanishes, and Melkur moves out of sight. The Doctor asks the Keeper to identify them, but he cries out, "Evil! The sanctum is invaded!. The Consuls ask about the identity of the Doctor and Adric, and Melkur stands at the doors of the room seen only by the Keeper, its eyes glowing red. Melkur is later seen striding from the Grove towards the courtroom. Neman and the other Fosters are sent to check the presence of the Doctor's craft in the grove, but before they arrive, red light is seen shooting from the Melkur's eyes towards the TARDIS, causing it to disappear. The consuls vote to summon the Keeper, just as the Doctor and Adric are brought before them. As the Doctor and Adric exit the Grove, they are surrounded by armed Fosters. The TARDIS emerges in the Grove, opposite to the Melkur statue.

Believing the man to have been murdered, Kassia says that the great danger necessitates that the Fosters be armed, but the Consuls cannot agree among themselves and summon Proctor Neman. He says that it means some force is taking control of Traken. Tremas scans the area, but the readings are off the scale of his instrument. A short time later, Fosters find a body outside the Grove and the Consuls are summoned to a meeting by Kassia.

A voice is heard emanating from Melkur echoing her word "soon". She pours out her heart to the inanimate statue about her concerns, that once Tremas becomes Keeper, he will be taken from her. In the grove, Kassia tends to Melkur for what is supposed to be the last time. Tremas and Kassia enter the Keeper's chamber to receive his blessing. On present-day Traken, Consul Tremas is marrying Kassia. A young Trakenite woman called Kassia is seen pitying the Melkur, leaving a bunch of flowers at its feet and saying she will come and visit it again soon. The creature's baleful influence cannot go beyond the groves, and it becomes calcified. On the scanner, the Keeper reveals images of Traken and of the arrival of an evil creature known as a Melkur years ago. He asks the Doctor to come to Traken but warns him of great danger. The Keeper reveals that he will soon die and have to pass on his powers to a successor. The Doctor identifies him as the Keeper of Traken. Suddenly they find themselves in orbit of Traken, and the figure of an elderly man on a throne appears within the console room. In the TARDIS, the Fourth Doctor and Adric have arrived back in N-Space near the star Mettula Orionsis, home to the Traken Union, famous for its universal harmony and where evil is non-existant. The TARDIS receives a visitor - the Keeper. The Keeper of Traken is nearing the end of his reign and seeks the Doctor's help in preventing the evil from taking control of the bioelectronic Source that is the keystone of the Traken Union's civilisation. The Fourth Doctor and Adric learn from the wizened Keeper of Traken that a great evil has come to his planet in the form of a Melkur - a calcified statue.
