Untold Tales is a Spectrum show that recounts and explores a single real-world mystery to the audience. The format varies depending on the subject. An episode may present actual footage, historian commentary, interviews with involved individuals, or re-enactments of incidents. Missing persons, unexpected alien discoveries, and unexplained historical events are the most common topics. The show's introductory monologue has become an element of popular culture, especially the final line, "These are the Universe's Untold Tales."