Channel 4 have released the trailer for Pure, a new drama about getting to know your mind and your mates.

The new six-part series centres around 24 year-old Marnie played by newcomer Charly Clive who has "bad" thoughts all the time and can't tell anyone.

Her mind is XXX-rated and intrusive thoughts are piling up inside her head. It turns out she’s actually caught in the grip of an excruciating type of obsessive compulsive disorder nicknames 'pure O' which sees her obsessions take the form of intrusive thoughts, often sexual. The compulsions are unseen mental rituals that deeply affect her daily life.

Only, Marnie doesn’t know this yet. All she knows is that something has got to give.