This one nails that crossover feeling of Doctor Who mixing with the world of the Wizard of Oz in a fun adventure with the Doctor's companions taking on the role of Dorothy's in an exaggerated fashion whilst encountering familiar creatures in the world of Oz that have been distorted to resemble those from the Doctor's memory. The answer lies in the castle of the Wicked Witch of the West who is someone all too familiar to the Doctor. The real star of the story is the youth accompanying them throughout their adventure, Theodore, who goes through quite the emotional journey culminating in a well executed twist.