Sally was a great singer, but a lousy actress, and she was ugly as hell.
Denise was a great actress, but her singing was awful, and she wasn’t much to look at.
Tracy looked amazing, but she couldn’t sing or act her way out of a paper bag.
All three showed up to the casting call.
The producer hired Sally to perform on the soundtrack. Then, he hired Denise to work with the stop-motion capture group.
What he did with Tracy, well, let’s just say that she ought to have a pimp instead of an agent.
The movie bombed spectacularly.