You're Only Young Twice!

Professor "Haywire" Hayman

Connell O'Grady aka Dan McEntee

Sir Archibald Asher

Adolphus Hayman

Ada Shore

Sheltie

Lord Carshennie

Nellie Kelly

The Bedellus

Lady Duffy

Maither

Radio reporter

Professor Baikie

Miss Mear

Milligan

Desk Sergeant

Student

Police Constable