Posey Clark is an excellent marksman and the radio operator for the North London Girl Guides. She is generally very cheerful, friendly, and optimistic. She displays a strong knowledge of gardening. Her parents were hippies and kept alpacas outside the city. It was at this patchouli-scented campsite that the guides were camping when the apocalypse happened.

The Girl Guides recruit Runner Five to help rescue Posey's half-sister, Cassidy, from some supposed cannibals. However, when Cassidy revealed that she'd stolen all the guns from the compound, Posey helped the rest of her guide friends turn Cassidy back over to the rest of the hippies.

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