At the Long Hampton Hospital, Dr Jimmy Nookey (Jim Dale) seems to attract trouble, beginning with an incident in the women's washroom, which he'd mistakenly entered, frightening the highly-strung Miss Armitage out of her senses. Nookey's carefree manner isn't to everyone's liking at the hospital, with Dr. Stoppidge (Charles Hawtrey) wanting Nookey sacked for the washroom incident. Accident-prone Nookey then quickly falls in love with a film star patient named Goldie Locks (Barbara Windsor). With the hospital Matron (Hattie Jacques) and his moody boss Dr. Frederick Carver (Kenneth Williams) watching his every move, Dr. Nookey drinks a fruit punch spiked by jealous Dr. Stoppidge at the staff party. The drunk Nookey ends up crashing through a window on a hospital trolley, after he had almost got into bed with a patient. Goldie leaves Nookey, as the latter is not interested in marriage. Meanwhile, Carver and his rich patient Ellen Moore (Joan Sims) dispatch the disgraced Nookey to Moore's medical mission in the Beatific Islands, where it rains for nine months of the year. Nookey discovers Gladstone Screwer (Sid James), the local medicine man, who has a weight-loss serum. Nookey soon returns to England and opens a new surgery with Mrs. Moore, much to the anger of Carver. While Matron joins Dr. Nookey's clinic, Carver and Stoppidge plot to try to steal the serum. Stoppidge dresses as a female patient to effect the theft, but his luck runs out when Nookey catches him in the act. Goldie returns to have the serum as well, much to Nookey's chagrin. Gladstone quickly discovers that Nookey is making a fortune from his serum, and cuts off his supply to deliver the serum in person and get in on the action. Nookey prevaricates, so Gladstone gives him a serum, which in fact seems to cause sex changes! The movie ends with Nookey and Goldie getting married and the rest of the staff of the Long Hampton Hospital becoming friends again.
Sid James as Gladstone Screwer
Jim Dale as Doctor Jimmy Nookey
Kenneth Williams as Doctor Frederick Carver
Charles Hawtrey as Doctor Ernest Stoppidge/Lady Puddleton
Joan Sims as Ellen Moore
Barbara Windsor as Goldie Locks (real name Maud Boggins)
Hattie Jacques as Miss Soaper, the Matron
Patsy Rowlands as Miss Fosdick
Peter Butterworth as Shuffling patient
Wilfrid Brambell as Mr Pullen
Elizabeth Knight as Nurse Willing
Peter Gilmore as Henry
Alexandra Dane as Stout woman
Pat Coombs as New Matron
William Mervyn as Lord Paragon
Patricia Hayes as Mrs Beasley
Lucy Griffiths as Old lady in headphones
Harry Locke as Porter
Gwendolyn Watts as Night sister
Valerie Leon as Deirdre Filkington-Battermore
Frank Singuineau as Porter
Valerie Van Ost as Out-Patients Sister
Simon Cain as X-ray man
Elspeth March as Hospital board member
Valerie Shute as Nurse
Shakira Baksh as Scrubba
Ann Lancaster as Miss Armitage
Frank Forsyth as Mr Bean (uncredited)
Georgina Simpson as Men's ward nurse (uncredited)
Eric Rogers as Bandleader (uncredited)
Donald Bisset as Patient (uncredited)
Bob Todd as Pump patient (uncredited)
Heather Emmanuel as Plump native girl (uncredited)
Yutte Stensgaard as Trolley Nurse (uncredited)
George Roderick as Waiter (uncredited)
Jenny Counsell as Night nurse (uncredited)
Rupert Evans as Stunt orderly (uncredited)
Billy Cornelius as Patient in plaster (uncredited)
Hugh Futcher as Cab driver (uncredited)
Faith Kent as Nursing home Matron (uncredited)
Wilfred Brambell's character was a non-speaking cameo in an early scene. When he appeared, the theme from Steptoe and Son was played over his scene.
the 18th release in the series of 31 Carry On films (1958–1992).
When the film was released by American International Pictures in New York in February 1973, they released it under the title Carry on Doctor.