Bobby (Michael Lookinland) wants to join Peter's (Christopher Knight) tree house club. Peter talks his buddies into letting his little brother join. Yet, before Bobby even has time to enjoy the view, he topples out of the tree and sprains his ankle. He also limps off with a severe fear of heights. Soon, all the Bradys band together and attempt to cure Bobby of his fear. They all trampoline and Greg even tries to tempt Bobby skyward with some stilts. Bobby isn't having any of it, until his pet bird, Budgie, flies his coop and lands in the backyard tree. Without enough time to think of the risk he's taking, Bobby ambles up the tree to save Budgie and finds his courage waiting for him at the top. This episode on acrophobia originally aired on December 11, 1970. ~ All Movie Guide