Triple

Given a phrase, classify it is english named entity (e.g., persons, organizations, works of art) in Latin script, or not (e.g., literals, dates, URLs, verbose phrases). For disambiguation, the statement where the phrase occurs as object is also given. Please return a JSON object with `phrase` (string, the phrase being analyzed) and `is_ne` (boolean, indicating whether the phrase is a Named Entity).

Phrase: Doctor Who serial Mission to the Unknown | Statement: [Derek Martinus, directed, Doctor Who serial Mission to the Unknown]

Target entity: Doctor Who serial Mission to the Unknown
Context triple: [Derek Martinus, directed, Doctor Who serial Mission to the Unknown]

• A. Doctor Who serial "Colony in Space"
  "Colony in Space" is a 1971 serial from the classic British science fiction television series Doctor Who, featuring the Third Doctor in a story about human colonists, a mining corporation, and the Master on a distant planet.
• B. Doctor Who serial "Spearhead from Space"
  "Spearhead from Space" is a classic 1970 Doctor Who serial that introduced Jon Pertwee as the Third Doctor and marked the show's first use of colour and all-film production.
• C. Doctor Who serial "The Daleks' Master Plan"
  "The Daleks' Master Plan" is a 1965–66 twelve-part Doctor Who serial, notable for its epic scale, multiple companion departures, and status as one of the series’ most ambitious and partially missing stories.
• D. Doctor Who serial "Time-Flight"
  "Time-Flight" is a 1982 Doctor Who television serial featuring the Fifth Doctor, notable for its Concorde-based time-travel plot and mixed critical reception.
• E. Doctor Who serial "The Ark in Space"
  "The Ark in Space" is a classic 1975 Doctor Who serial featuring Tom Baker’s Fourth Doctor battling an insectoid alien threat aboard a space station preserving the last remnants of humanity.
• F. None of above. chosen
• G. Unsure - the case is ambiguous/there is not enough information to decide.

Generate a one-sentence description of the target entity. 
You are given a context triple in the form (subject, predicate, object), where the object is the target entity. 
# Instructions
Use the triple to infer relevant information about the entity. Describe the entity based on what is most defining, well-known. 
Avoid repeating the information from the triple, unless really essential.
# Response Format
Return only the sentence: "Description: [one-sentence description of the target entity]"

Entity: Doctor Who serial Mission to the Unknown
Triple: [Derek Martinus, directed, Doctor Who serial Mission to the Unknown]

"Mission to the Unknown" is a unique one-episode 1965 Doctor Who story that serves as a prologue to "The Daleks' Master Plan," notable for featuring no appearance by the Doctor himself.

Target entity: Doctor Who serial Mission to the Unknown
Target entity description: "Mission to the Unknown" is a unique one-episode 1965 Doctor Who story that serves as a prologue to "The Daleks' Master Plan," notable for featuring no appearance by the Doctor himself.

• A. Doctor Who serial "Colony in Space"
  "Colony in Space" is a 1971 serial from the classic British science fiction television series Doctor Who, featuring the Third Doctor in a story about human colonists, a mining corporation, and the Master on a distant planet.
• B. Doctor Who serial "Spearhead from Space"
  "Spearhead from Space" is a classic 1970 Doctor Who serial that introduced Jon Pertwee as the Third Doctor and marked the show's first use of colour and all-film production.
• C. Doctor Who serial "The Daleks' Master Plan" chosen
  "The Daleks' Master Plan" is a 1965–66 twelve-part Doctor Who serial, notable for its epic scale, multiple companion departures, and status as one of the series’ most ambitious and partially missing stories.
• D. Doctor Who serial "Time-Flight"
  "Time-Flight" is a 1982 Doctor Who television serial featuring the Fifth Doctor, notable for its Concorde-based time-travel plot and mixed critical reception.
• E. Doctor Who serial "The Ark in Space"
  "The Ark in Space" is a classic 1975 Doctor Who serial featuring Tom Baker’s Fourth Doctor battling an insectoid alien threat aboard a space station preserving the last remnants of humanity.
• F. None of above.