Horrorkon

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You may be looking for Terrorkon.

Horrorkons were feared creatures native to the swamps of Gurnian. They had two long-necked heads with a pair of sharp teeth each, two tentacles, six legs, and a tail. Originally believed to be vicious and unruly, the creatures were kept in check by patrolling Marsh Daleks.

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 [+]Loading...["Monsters of Gurnian (comic story)"])

The Seventh Doctor battled against either a Horrokon or a Terrorkon in London's sewers. (GAME: Dalek Attack [+]Loading...["Dalek Attack (video game)"])