The PCS Rangi is a City-Ship, named after the Maori Sky Father. It was constructed several thousand years in the distant past, when Morgan was bored one night, so he decided to steal Briony's TARDIS for a little spin. He ended up accidentally ordering the construction of the PCS Rangi, before having it sent to Pluto, to await arrival of a population in the present day. It came equipped with several ZPMs, which powered the shield holding the atmosphere inside.