One Small Step... was the fourteenth short story in the Short Trips anthology Short Trips: Past Tense. It was written by Nicholas Briggs. It featured the Second Doctor, Jamie McCrimmon and Zoe Herriot.
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- Cows are always very friendly towards the Doctor.
- The Doctor mentions Quarks, (TV: The Dominators) Krotons, (TV: The Krotons) Cybermen (TV: The Invasion) and "deadly clockwork robots". (TV: The Mind Robber)
- TARDIS is invisible. (TV: The Invasion)