Mechanus

Mechanus was the jungle planet that was home to the Mechonoids.

Shortly after encountering the Mechonoids, the Daleks set the rogue planet Skardal on a collision course with their home world. The Zerovians' robot agent 2K prevented Skardal from destroying Mechanus. (COMIC: The Rogue Planet, Impasse)

Humans sent Mechonoids to Mechanus to prepare the planet for colonisation, but Earth got caught up in interplanetary wars such as the Human-Draconian War, the Second Dalek War and Third Dalek War (PROSE: The Chase) and the colonists never arrived. Steven Taylor crashlanded on the planet and was taken prisoner by the Mechonoids. The Mechonoids and their city were destroyed by the Daleks, and Steven departed in the Doctor's TARDIS. (TV: The Chase)

Behind the scenes

 * According to non-narrative material in DWBIT 3, an account was taken of the Daleks' battle with the Mechonoids during the former's mission to capture the Doctor.
 * In a Christmas ident when a Dalek is booking a flight from an Earth airport Mechanus is noted to be near Skaro.