Johnny is the eager-to-please ASM and understudy to arrogant actor Roger Kite,who is due to play Andy Warhol in 'The Fifteen-Minute Factory',an upcoming West End production. Roger treats Johnny abominably,forcing him to make his coffee,sort his fan mail and - particularly - keep him away from the theatre's lucky mascot,a black cat called Diddly. As the opening night approaches ...