Arkive was an ancient machine that was created to preserve the memory of an extinct race.
Abilities
Arkive was roughly spherical and several hundred metres wide. It was originally made with rocket engines and solar sails, but both were badly damaged in its initial launch. Inside was an unknown power-source, possibly a miniature black hole. The Arkive contained a matter replicator, intended to recreate its creators. It used this to create the Blue Dolls and Blue Soldiers. Its hull was made of a bernalium alloy. Arkive produced neutrinos to communicate. (PROSE: The Wheel of Ice)
History
Roughly 5 billion B.C., there was an unknown species. When a supernova from a nearby star threatened their planet, they planned to create the Arkive to preserve their history. Unfortunately, the supernova didn't react as expected and Arkive was badly damaged and thrown out of the system. It drifted through space for millions of years until it came to the gas cloud that would make up the Sol system. It formed the inside of Menmosyne, a moon of Saturn.
Around 50 million B.C., the Arkive decided to try to save its mission by sending a message back in time. Two plans were used at once; an allohistorical lure would be sent back in time to contact original creators. This process would destroy of moon of Saturn, which would attract the Silurians on Earth. Both plans failed; the lure only went back to 100 million B.C. and the Silurians were too busy preparing for the rogue planet to investigate Saturn.
Luckily, the lure was fossilized and preserved until it was found during the excavation of the London railway in 1890. It was bought by Josephine Laws and passed through the generations until it reached Phee Laws. She was one of the people who decided to colonise the moons of Saturn. The Mnemosyne Cincture was created around Menmosyne and the humans started mining for the Bernalium that had seeped from Arkive's hull. Arkive sent out small probes to investigate the humans. The probe happened to encounter Casey Phee, who was used as a template for the Blue Dolls. These Dolls were sent out to collect material to create a working time machine. They came into conflict with the humans, but most of their activities were blamed on children. While the Second Doctor tried to communicate with the Blue Dolls, they were attacked by Florian Hart, who had a grudge against aliens. The Arkive created Blue Soldiers to fight back, causing a brief skirmish. Once the fighting had died down, the Doctor tried to communicate again with Arkive again. Though he succeeded, he had to deal with Florian Hart again, who had set up a Z-Bomb to destroy the Arkive. Once it was disabled, the Doctor set up a plan to create a working time machine to send a message back to Arkive's creators. (PROSE: The Wheel of Ice)