S2·E7 A Star Is Blossom

Blossom thinks she's a shoo-in for the lead role in a school play. When the list comes out, it's Bubbles who wins the lead role. Blossom, resigned to playing a rock (with no dialogue at that), Blossom tries to sabotage Bubbles' appearance until a Viking queen shows up after being summoned from a book (from which the play's script comes) and takes the male lead, Jared Shapiro, to get him to marry her.