This story centers around a cactus-man who shows up on the planet Tygella, pretending to be the Doctor (played by Tom Baker), while the real Doctor and Romana (Lalla Ward) are stuck inside the TARDIS trying to get free from – seriously – a continuous time loop fueled by hysteria. If they don't manage to break out of this situation quickly enough, Meglos might accuse him of a terrible crime and seize control of the sa…