Hancock is given a small part in the East Cheam Repertory Company's production of 'Moon Over Tahiti' but then they forget to tell him when the play is changed to 'Lady Chatterley's Revenge'.

Hancock bumps his head and suffers from temporary amnesia. Whilst he is unable to remember who he is, Sid persuades Hancock that he is Prince Nicolai, the last heir to the Russian Royal Family's fortune... but there are others making the same claim.

Hancock is really looking forward to a big night out with Sid and two girls. But his preparations turn to disaster when his shirt is ruined at the launderette and his barber doesn't have a steady hand with his razor.