Number 79b, Aickman Road was a Timeship that had crash-landed on Earth sometime before 2010, killing all of its crew. The ship disguised itself by pretending to be the second floor of 79 Aickman Road, a flat owned by Craig Owens. It used a perception filter to hide its true nature from passers-by.
The ships Auto Pilot attempted to relaunch the ship using humans as pilots, specifically selecting humans who wanted to escape or explore. However, the mind of a human was too weak to launch the ship, and so the people selected by the Auto Pilot were killed. The Auto Pilot later attempted to use the Doctor's mind to launch the ship, but the Doctor claimed that his mind would be too much for the ship. Craig Owens was able to shut down the ship because he didn't want to escape or explore; he wanted the opposite.
The Doctor, after first seeing it, called it "someone's attempt to build a TARDIS". While he may have meant that the ship was made to be a time machine rather than a TARDIS specifically, the ship did hold a dark resemblance to one (based on the layout of the room as well as a device that looked strikingly like a time rotor).
The ship imploded when the emergency shutdown was activated by Craig.
Behind the Scenes
- Number 79B, Aickman Road resembles the Jagaroth ship. A Nother jagaroth could be behind the ship because timp loops are seen in the city of death and scaroth also tryed to creat a time ship
- Though possibly just a coincidence, 2 of the 3 Auto Pilot holograms bore some resemblance (from what little could be seen) to the first and second doctor.