The Boxcar Children are in a show. Jessie is chosen to play the Cowardly Lion. Benny will play a munchkin. Even Watch has a part. Then mysterious things begin to happen. Someone makes a threatening phone call and a costume is destroyed. What next!?

The Aldens are starring in The Wizard of Oz—and even Benny and Watch have roles! But as the children get ready to perform, mysterious things start to happen. Can the Boxcar Children find out what's going on and save the show before opening night?