9x17 The Legend of the Clock Tower

The Rangers try to fix the clock in the tower. But are having no luck. Wes tells them of a ghost that is supposed to inhabit the tower. That night Katie hears a noise, and she investigates. She finds herself in the past, and meets the people from Wes's story. With her help, there's a different ending to the story, then she wakes up as a mutant attacks. After the battle, she tells her friends about her dream and how the ending had changed, but Wes corrects her and says that's how he had told it. Leaving her wondering if it really was a dream.