Episode 4 - Sneak Peek 1

The Doctor, Maya, and Greg walk through the forest until they reach a chain-linked fence, The Doctor looks through the fence and sees people laying on the floor dead. Maya looks in shock "The Cybermen did this?" The Doctor nods at her "yes they did" Greg looks at him "but you said they changed people, they killed them-" a woman's voice then goes "do not move! Hand's up!".