Newly recruited Time Agents find themselves in Tibet, where a Buddist Monastry is under attack from Yeti. But all is not what is seems and an alien menace threatens the world.

The Time Agents find themselves on sailing ships - flying through space. It's a race for the amusement of strange, immortal beings with great powers. They must find out what is going on and stop the forces of darkness from winning the race.

On a dangerous, alien jungle world, the Time Agents find a crashed space ship that is struggling to warn Earth of a terrible danger ...

London Underground has been invaded by webs and yeti. The monsters from Tibet have returned. The Time Agents must survive UNIT troops, interfering enemy Agents and yeti monsters, to defeat the Intelligence before it's too late.

The Time Agents are sent in a Time Capsule to another dimension, where they must find rogue Time Agents who are interfering with history. The strange dimension seems to manifest people and places from fiction, who are as dangerous as the real thing.

Following clues from their previous mission, the Time Agents are sent to what seems to be the trenches of the First World War. When they pass through some mists into another time zone, they realise humans are being trained for fight for alien masters.

In the future, enemy Agents are bringing the Galaxy to the brink of inter-planetary war. The Time Agents must find out who is really behind the attacks on space ships and uncover them, before it's too late.

Searching for Frederick leads the Time Agents to a planet where colonists and miners are in conflict. An ancient culture on the planet suggests lost technology. Enemy time agents and a rogue Time Lord with powerful friends make the situation very dangerous.

The Daleks have taken some valuable tyranium from the colony planet. The Time Agents pursue with help from a Space Special Security Agent. They find a planet where the Daleks are curing people affected by a terrible plague, but the cure is changing the patients.

On a cold, backward planet, the Time Agents discover a conman is trying to trick a powerful Warlord. They must navigate through this dangerous situation and find the first segment of the Key to Time.

The Time Agents find themselves on a planet that eats other planets and it had gone wrong. They must somehow pretend to help with the repairs while searching for the next segment.

A stone circle hides alien monsters and something in hyperspace. The cult of an ancient Celtic Goddess threatens the Time Agents in their quest for the next segment.

A strange, lion-like figure enters their Time Capsule and resets the co-ordinates. The next segment is not on the planet Tara, where it should be. It appears to be through a gateway, behind a mirror guarded by robots. Can the Time Agents unravel this mystery and complete their mission?

A gas refinery on a planet with primitive population of squid worshipping natives. They must unravel the secret of the refinery's source of energy and find the next segment before a terrible monster destroys them all.

Nuclear war rages between two planets. The Marshal will broker no peace, only victory. But but where is the enemy planet? The Time Agents find themselves in a very dangerous situation as the forces of Darkness have intervene to stop the Key to Time from being assembled.