Thorne began his stage career at the age of two, when he was carried on at the Theatre Royal, Margate, in the burlesque Medea.
Thorne joined a D'Oyly Carte touring company in 1881, playing Captain Felix Flapper in Billee Taylor.
Pinafore, Major General Stanley in The Pirates of Penzance, and Bunthorne, with a D'Oyly Carte touring company, adding the roles of Lord Chancellor in Iolanthe and Ko-Ko in The Mikado in 1885.
From 1887 to 1890 (with a break in late 1889 to early 1890, when he contracted typhoid fever), he toured playing Bunthorne, Ko-Ko, Sir Joseph, and later the Major General and Jack Point in The Yeomen of the Guard.
[5] From 1890 to 1896, Thorne was the principal comedian with a D'Oyly Carte touring company, playing John Wellington Wells in The Sorcerer, Sir Joseph, the Major General, Bunthorne, the Lord Chancellor, King Gama in Princess Ida, Ko-Ko, Jack Point, and the Duke of Plaza-Toro in The Gondoliers.
From 1896 to 1897, he was on the first D'Oyly Carte tour of South Africa, playing his usual roles, as well as Scaphio in Utopia Limited and Rudolph in The Grand Duke.