Horrorkons were two-headed, monstrous creatures native to the swamps of Gurnian. Originally believed to be vicious and unruly, the creatures were kept in check by patrolling Marsh Daleks.
- You may be looking for Terrorkon.
It was later discovered by two humans who had eluded Dalek capture that the Horrorkons were surprisingly docile, having a savage appetite only for metal. (COMIC: Monsters of Gurnian)
The Seventh Doctor battled against either a Horrokon or a Terrorkon in London's swers (GAME: Dalek Attack)