Night Travellers Trapped on film films with their ghosts trapped inside, confirmed by a scene at a boot-sale where a man and his son purchase an old film reel. The metal case of the film is briefly opened and, back at the the old cinema "Electro" re-opens and the characters start roaming the streets of Cardiff.
A Nostrovite, a race of carnivourous shape shifters who hunt in pairs and mate for life.
Death searches for 13 victims whose consumed souls will enable it to remain in our world
An alien parasite that resides in the brain.
The Pharm, responsible for the drug "Reset", releases alien parasitescalled Mayflies into the human bloodstream,the larvae proceed to "reset" the human body.
Adam has the power to reveal, alter and fabricate memories.
A whale like, sentient creature captured and used as a cheep source of meat.
Sleeper agents lead a normal life,unaware of there status until activation, with their right arms transforming into bayonet-like weapons. They carry out missions to clear the way for the main invasion force
Captain John Hart, a fellow Time Agent first appeared in Kiss Kiss Bang Bang and later in the final episode of series 2, Exit wounds.
Alien Blowfish, first seen in "kiss kiss bang bang" and then captured by jack on a mission for torchwood in "fragments".
Aboddon came from the rift. He is described as "son of the great Beast"
Bilis has the ability to walk through time and teleport at will. He tried to make the Torchwood team open the rift.
Earth's atmosphere is poisonous to the alien sex monster, so it needs to take a human host to survive for prolonged periods.
Half Human, Half Machine
Lisa was Iantos girlfriend before she got turned into a cyberman
They are called faries by humans but it isn't known what they are. They are not aliens but have lived alongside humans since the dawn of time.
A Telepathic Alien
An aggressive alien with low intelligence