Desperus

From TARDIS Index File, the free Doctor Who reference.

Desperus
Other names:
Type:	Planet
Location:	Mutter's Spiral
Natives:	Screamers Criminals from Earth, including Bors, Garge and Kirksen
Appearances:	DW: The Daleks' Master Plan EDA: Placebo Effect (mentioned)

Desperus was an Earth prison world where the criminals were dumped to fend for themselves or die. As Bret Vyon stated, the only ships that stopped there were prison ships from Earth. There were no guards or prison warders. The Doctor crashed there on the Spar 7-40 while trying to stop the Daleks' master plan. They managed to take off again, although not before they had picked up a stowaway, Kirksen. (DW: The Daleks' Master Plan)