YMMV / X the Unknown

• Retroactive Recognition:
  • Ian is played by a young Frazer Hines, who, ten years later, played Jamie McCrimmon on Doctor Who.
  • Lancing's actor, Kenneth Cope, forty-three years later, played Ray on Liverpool-set soap opera Brookside.
• Spiritual Successor: To The Quatermass Xperiment, Hammer's recent adaptation of Nigel Kneale's televised serial, in which a Science Hero faces an amorphous monster which rampages with lurid, potentially cataclysmic consequences.