Clom

From TARDIS Index File, the free Doctor Who reference.

Clom
Other names:	Klom
Type:	Planet
Location:	Unknown, near Raxacoricofallapatorius, therefore likely also located in the Isop Galaxy
Natives:	Abzorbaloff
Appearances:	DW: Love & Monsters (mentioned), The Stolen Earth SJA: Revenge of the Slitheen (mentioned)

Clom (alternatively spelt Klom) is the twin planet of Raxacoricofallapatorius. The inhabitants of both worlds are similar in physical characteristics, but seem to despise each other nonetheless. The Abzorbaloff is a native of Clom. (DW: Love & Monsters)

Clom is also sworn on by a Slitheen as "for the love of Clom". (SJA: Revenge of the Slitheen)

Clom was one of the 27 planets "stolen" into the Medusa Cascade, to which the Doctor replied "Who'd want Clom?" Clom was later returned by the Doctor, the Clone Doctor and Donna Noble to its correct place. (DW: The Stolen Earth / Journey's End)