The TARDIS finds itself near "Traken," and the Doctor (Tom Baker) and his new companion, "Adric" (Matthew Waterhouse), are greeted by an aged guardian who warns of trouble involving “Melkur.” He requests the time lord’s assistance in preventing a looming threat. Upon arrival, they immediately encounter suspicion from the inhabitants, realizing that “Melkur's” machinations have already begun and he has gained support …