'So, this is the blue planet you’ve forgotten about. But take another look. You helped us once. I know you can help us again.'
On Earth, civilization has ended and time is running out for the Doctor and Charlotte Pollard.
Will the mysterious Viyrans really help?
'Without you, the human race will die out. And Planet Earth will surely be our tomb.'
The Viyrans are an allusive race of aliens heard in Big Finish Productions audio stories. They originate from a distant galaxy that waged a huge war using a wide variety of powerful technologically advanced biological weapons. A final peace agreement was reached and the biological weapons were gathered together at the Amethyst Viral Containment Station with the intention of destroying them. But then there was an incident involving the Sixth Doctor and the Daleks and all of the dangerous virus weaponry was spread throughout the universe, landing on various worlds and causing havoc.
The Viyrans come from that distant galaxy. Their job is to seek out all the stray viruses, neutralize them and cure any victims, if possible. They also feel it's their duty to make sure no one finds out anything about any of this, in case someone of low morals tries to track down some of these viruses themselves.
They have no real spoken language, but communicate psychically or through hand motions or sometimes by trying to replicate an individual's voice. They can also time travel. What they actually look like is a mystery, but they are humanoid in shape, always appearing in a white type of hazmat suit. When they find an infected location, they block off the area and work in secret, never letting anyone know they were there, before, during or after. They collect all the victims in flying glass coffins and attempt to cure them. If the infected individuals can be cured, they are returned and their memories of the events are erased. If not, they are destroyed.
The first appearance of The Viyrans was in a short story called No One Died from the 2007 Doctor Who Storybook, featuring the Tenth Doctor and Rose Tyler. Their first appearance in an audio story was Mission of the Viyrans with the Fifth Doctor and Peri Brown. The viral explosion is witnessed in Patient Zero. In Blue Forgotten Planet it is revealed that Charley Pollard is employed by the Viyrans after they cure a virus she contracted.
Although they did not appear themselves, their engineered viruses were featured in Urgent Calls, Urban Myths and The Wishing Beast & The Vanity Box. These one part stories (and Mission of the Viyrans) were listed in their booklets as being part of the "Virus Strand" arc. Some of the viruses they've tried to neutralize include a virus that can destroy the minds of an entire planet (No One Died), a particle that can induce beneficial coincidences for communications devices (Urgent Calls), an exaggerating frenzy illness (Urban Myths), a living wish-granting device (The Wishing Beast & The Vanity Box) and a rapidly spreading contagion that crudely distorts DNA, slowly killing its victims (Mission of the Viyrans).