Scaroth intends to travel back in time to save his own people from destruction. But the Doctor can't allow him to succeed as it would mean the destruction of all life on Earth.
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The Doctor and Romana follow a distress signal to the jungle world of Chloris. The planet is ruled by the ruthless Lady Adrasta who takes the Doctor prisoner.
The Doctor has escaped Adrasta's wrath by jumping down the pit into the last remaining metal mine on Chloris. But the pit is also the home of a monstrous creature.
In the pit, the Doctor establishes contact with the creature and begins to suspect that all is not as it seems.
With Erato now able to communicate, the truth of Adrasta's scheming is revealed but a terrible retribution has already been put in motion.
A terrible hyperspace accident results in two starships becoming locked together. The Doctor arrives and discovers that the incident may have also released a deadly menace.
The Doctor and Romana are horrified to discover that Tryst has been storing real life forms in his CET machine and that someone is smuggling the dangerous narcotic, Vraxoin.
The terrifying Mandrels have escaped from Eden and are attacking people aboard the Empress. The Doctor and Romana, accused of being smugglers, are pursued by customs officers.
The Doctor solves the mystery of the drug smuggling racket and the culprits are revealed. But unless the Doctor and Romana act quickly, the villains will escape justice.
With the TARDIS disabled for repairs, the Doctor is powerless to act when Romana is kidnapped by a battleship en route to Skonnos and the formidable Nimon.
On Skonnos, Romana and the Athenian youngsters are forced into the labyrinth of the power complex to meet their fate at the hands of the Nimon.
Trapped inside the power complex, the Doctor and Romana begin to suspect that the Nimon is only the first of a full scale invasion.
On the dying world of Crinoth, Romana discovers the truth behind the Nimon's empty promises. The Doctor must find a way to shut down the power complex on Skonnos.
30 minutes
First broadcast:Available for years
The Doctor and Romana have unfinished business in Cambridge, 1979, with the elderly Professor Chronotis.
30 minutes
First broadcast:Available for years
'Beware the sphere. Beware Skagra. Beware Shada. The secret is in the...' What can the Professor's cryptic last message mean?
30 minutes
First broadcast:Available for years
Without the Professor, the Doctor and Romana are forced to think on their feet. But what large invisible object lurks nearby?
30 minutes
First broadcast:Available for years
The Doctor, Chris and K9 race to rescue Romana from Skagra. Claire makes a startling discovery about the Professor's rooms.
30 minutes
First broadcast:Available for years
Answers come think and fast, but no explanation can prepare the Doctor, Chris and K9 for what they find on Shada.
30 minutes
First broadcast:Available for years
Things look desperate. Skagra is almost within grasp of Salyavin's power. Can the Doctor save the day with his special helmet?
The TARDIS lands on the old Dalek homeworld of Skaro where the Doctor and the newly regenerated Romana discover that someone is digging deep beneath the planet's surface.