This scene takes us away from the regal households and out to the seashore on another part of the coast of Illyria. The two new characters who are introduced, Sebastian and Antonio, form the third plot line of the comedy. Sebastian is Viola's twin brother whom she believes was probably drowned at sea, and this fact will create comic complications, which will be resolved in the fifth act. Like his sister, Sebastian is kind and good-looking. When Sebastian describes his sister as a lady "though it was said she much resembled me, was yet of many accounted beautiful," we are being prepared for the confusion later in the play when Sebastian will be mistaken for Cesario (Viola), and Viola (as Cesario) will be mistaken for Sebastian by Antonio, the sea captain.
Sebastian will appear throughout the rest of the comedy as more impulsive and more emotional than his twin sister; for example, he will consent to marry a woman (Olivia) whom he has just met — an act of extreme impetuosity. But yet we must assume that Sebastian possesses many good qualities to have attracted the loyalty of such a stalwart man as the sea captain, who decides to risk his life to accompany the handsome young lad to Duke Orsino's court.
