100,000 bc

Understandably overshadowed by news of the tragic assassination of John F Kennedy the day prior, the first episode and story arc of Doctor Who (previously) was broadcast on the BBC on this day in 1963. An Unearthly Child (alternative title above) introduces the first incarnation of the Doctor and his original companion, his granddaughter Susan Foreman.
When Foreman espouses strange views on England in the classroom, her teachers, concerned, think to check on her home life. The address on file led them to a junkyard with a police box in the centre and hearing their pupil’s voice inside, they force their way inside. Fearful that the teachers will betray their secret identities as fourth-dimensional itinerants, the Doctor does not allow them to leave and transports them all back to Palaeolithic times.