(3 episodes): Planet Of Giants - Dangerous Journey - Crisis
The TARDIS doors open while the ship is still in flight by accident. Although they have arrived back on Earth in the 1960s, a time they have been trying to return to since they all met, the travellers soon realise that something is very wrong. The Doctor, Ian, Barbara and Susan discover that they have all be reduced in size and the world they are now exploring has dangers at every turn...
Written by Louis Marks
(6 episodes): World's End - The Daleks - Day Of Reckoning - The End Of Tomorrow - The Waking Ally - Flashpoint
Arriving in a devastated London in the middle of the 21st century, the Doctor, Ian, Barbara and Susan discover that the Daleks have invaded Earth. Will the human race be enslaved by the evil Daleks, or can the Doctor stop their audacious plans and save mankind from extermination?
Written by Terry Nation
(2 episodes): The Powerful Enemy - Desperate Measures
When the TARDIS lands on the supposedly peaceful planet of Dido at the end of the 25th century, the Doctor, Barbara and Ian discover a crashed spaceship waiting for help. The only survivors have been murdered by natives, apart from a young orphaned girl and a paralysed man. But who is the strange creature Koquillion that they are afraid of? And will they remain safe long enough to be rescued?
Written by David Whittaker
(4 episodes): The Slave Traders - All Roads Lead To Rome - Conspiracy - Inferno
Italy, 64AD. Enjoying a rare holiday with his companions, the Doctor takes Vicki to visit Rome, where he is mistaken for the musician Maximus Pettulian. He finds himself obliged to perform for Nero, or risk incurring the Emperor's wrath... In his absence, Ian and Barbara have been kidnapped from their villa. Separated and sold into slavery, they face a bleak future. Can they make their escape and find the Doctor before Rome is consumed by fire?
Written by Dennis Spooner
(6 episodes): The Web Planet - The Zarbi - Escape To Danger - Crater Of Needles - Invasion - The Centre
A mysterious force pulls the TARDIS off course, stranding the Doctor, Ian, Barbara and Vicki on the mysterious alien world of Vortis. A fierce battle is raging between the moth-like Menoptra, and giant insects known as Zarbi. But what is the dark secret that hides at the centre of the Zarbi's lair...?
Written by Bill Strutton
(4 episodes): The Lion - The Knight Of Jaffa - The Wheel Of Fortune - The Warlords
The TARDIS materialises in the middle of a holy war between King Richard the Lionheart and the Saracen leader, Saladin, in 12th Century Palestine. As the Doctor, Vicki, Ian and Barbara explore their surroundings, they are suddenly caught up in a Saracen ambush and Barbara is kidnapped. For the time travellers, intrigue and espionage ensue as they once again become involved in living history. A newly-knighted "Sir Ian of Jaffa" makes haste to find and rescue Barbara, whilst the Doctor finds it difficult to stay out of trouble in the court of the King...
Written by David Whitaker
(4 episodes): The Space Museum - The Dimensions Of Time - The Search - The Final Phase
The TARDIS lands on the planet Xeros, where a vast museum houses a collection of relics from the galactic conquests of the mighty Morok Empire. While they are exploring, the Doctor and his companions make a disturbing discovery: their future selves are preserved as exhibits!
Written by Glyn Jones
(6 episodes): The Executioners - The Death Of Time - Flight Through Eternity - Journey Into Terror - The Death Of Doctor Who - The Planet Of Decision
When the Doctor and his companions discover that a group of time-traveling Daleks have orders to exterminate them, a dangerous chase across time and space ensues.
Written by Terry Nation
(4 episodes): The Watcher - The Meddling Monk - A Battle Of Wits - Checkmate
The TARDIS lands on the Northumbrian coast, where new companion Steven discovers a Viking helmet and the Doctor deduces they must have arrived in the 11th century. Steven remains sceptical, especially when he and Vicki encounter what appears to be a Saxon hunter with a modern wristwatch. Investigating a nearby monastery, the Doctor discovers further anachronisms. Who is the mysterious monk observing the time travellers' every move, and why is he so interested in the outcome of the Battle of Hastings?
Written by Dennis Spooner