What is episode 18 of Sonny With a Chance about?

Answer 1

Mandy, an old cast member (Which was mentioned in Sketchy Beginnings) visits while on vacation. She starts to act like Sonny because the rest of the cast likes Sonny and doesn't like Mandy anymore and when she finds out Sonny replaced her, she steals the attention. Meanwhile, Sonny is walking around the studio to try to think everything out and runs into Chad, so they go to Sonny's dressing room and Sonny tells Chad what is happening, Chad feels bad for Sonny and comforts her. Tawni walks in on Sonny and Chad almost kissing (to her amazement).