Prom Wrecker - S2-E5
Trivia: In "Prom Wrecker" when the power goes out a video with disturbing pictures comes up. A few seconds before it cuts to break, a small clip from the iCarly episode "get Pranky." The clip is the same one that pops up on Carly's screen/mirror thing when Spencer prank ed her by putting a scary face on it. This zombie face is actually Lebwart.
Answer: The Director hated working with Melinda, but knew that her superstar popularity and status would get his movie a big buzz and higher ratings. And the movie was discontinued for a re-audition to fill-in Melinda's leading/major role.