 a Dish of Tea With Dr Johnson  a rare and civilised treat in Out of Joint's touring production. Salisbury Playhouse (01722 320333/www.outofjoint.co.uk) tomorrow to Thursday. Then touring.  Fen  Caryl Churchill's magnificent 1983 feminist play about the lot of Fenland women. Finborough, London (0844 847 1652), until 26 March.  Moment  Deirdre Kinahan's gripping variation on the prodigal-son story. Bush, London (020-8743 5050), until 26 March.  Frankenstein  Danny Boyle's galvanic production carries its own shocks. Olivier, London (020-7452 3000), today until Thursday.  The Heretic  Juliet Stevenson shines in Richard Bean's pugnacious play about climate change. Royal Court, London (020-7565 5000), until Saturday.