Charles has a serious toothache, but hates the thought of having anything done about it. The doctors suspect prejudice when an inordinate number of black casualties are brought in from a single unit, led by Major Weems.

The TARDIS lands on the jungle planet Deva Loka, where an Earth expedition has been sent to study the Kinda, a tribe of primitive people. Three team members have already vanished. Are the Kinda as primitive as they seem?