William Topaz McGonagall claims himself the world's greatest poet. Unfortunately the whole of the rest of the world disagreed.

Spike Milligan ... William McGonagall
Peter Sellers ... Queen Victoria
Julia Foster ... Mrs. McGonagall
John Bluthal ... Mr. Giles / MacDuff / Hercules Paint / British Soldier / Policeman / McLain / Sheriff / Judge
Victor Spinetti ... Mr. Stewart / Second-Lieutenant Rotlo / Supposed John Brown / Gentleman / Revolutionary / Cardinal / Policeman
Valentine Dyall ... Army Sergeant / Lord Tennyson / Doctor / Native Messenger / Policeman / Fop
Julian Chagrin ... Prince Albert / Rev. Gilfillan / Publican / Balmoral Policeman / Stagehand / Ruffian / Mr Stewart's Assistant / British Soldier / Fop
Clifton Jones ... King Theebaw / Policeman / Clerk of the Court / Mr Stewart's Assistant / Zulu Chief / Ruffian / Fop
Charlie Young Atom ... Postman / Policeman / Sleeper in the Snow / Theatre Announcer / Drinker (as Charlie Atom)
Luie Caballero ... Man with parrot
Jan Adair ... Dancer
Lewis Alexander ... Member of Royal Entourage
Malou Cartwright ... Barmaid
Walter Henry ... Theatre Audience
Aileen Lewis ... Member of Royal Entourage
Tony Mendleson ... Theatre Audience
Reg Thomason ... Theatre Audience
John Wilder ... Theatre Audience