Horg

Horg was a member of the Tribe of Gum. When the tribe's leader Za took too long to secure the secret of making fire from the Doctor and his companions, Horg led the tribe in an uprising, which Za's wife Hur tried but failed to prevent. When Za suddenly emerged from the Cave of Skulls bearing a flaming torch given to him by the man called "Friend," Horg backed down and acknowledged Za as his leader. Horg was later among the tribe members who pursued the four strangers after their escape, and witnessed them enter their mysterious blue tree, which vanished before their eyes.