The Ugly Duckling is a 1959 British science fiction comedy film, directed by Lance Comfort and starring Bernard Bresslaw, Jon Pertwee and Reginald Beckwith.

They give a display of formation ballroom dancing with their brother Victor Jekyll taking over the conducting, but Henry turns it into a disaster, much to his sister's dismay.

The scroll contains an old formula created by Dr Jekyll in the 19th century which claims to turn "a man of timid disposition into a bold, fearless dragon".

He eagerly mixes the formula, takes one drink, and is transformed into the suave, dashing and self-confident Teddy Hyde, who makes a big impression at the local dance hall and with the ladies.

Teddy leaves just as the potion wears off and Henry wakes in his bed with a bad headache, and his only memory of the events of the previous night is that he thinks it was a dream.

When Snouty tells Victor that the person at the dance hall was called Hyde, he immediately understands the connection from the family history and realises something must be done.

Next morning, when Victor and Snouty see Henry, who again has a bad headache and cannot remember where he was last night, they question him and are shocked to find the jewels still in his pocket.

[1] A brief extract from James Bernard's theme to Dracula (1958) (also made for Hammer Films) is played whenever Jekyll drinks the potion.

Bernard Bresslaw performs well enough within his limited range and is supported by a carefully chosen cast but, whatever the possibilities of a Jekyll and Hyde skit, the script barely starts to explore them.