 Grossmith's first role in a musical was at the age of 18 in a small comic role in his father's collaboration with W. S. Gilbert, "Haste to the Wedding".He next appeared in several small comic roles, including in "The Baroness" (1892).Grossmith's breakthrough came in "Morocco Bound" (1893), where he made the most of the small role of Sir Percy Pimpleton by adding ad-libbed sight and word gags, becoming an audience favourite and establishing his style of playing "dude" roles.