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Battlefield is the first serial of the 26th season in the British science fiction television series Doctor Who, which was first broadcast in four weekly parts from 6 September to 27 September 1989. It was the last to feature Brigadier Lethbridge-Stewart in Doctor Who.

In response to a distress signal, the Seventh Doctor and Ace materialize the TARDIS near Lake Vortigern in England. The sound of explosions leads the TARDIS crew to Brigadier Bambera of UNIT, in charge of a nuclear missile convoy. Following the encounter, the retired Brigadier Alistair Lethbridge-Stewart is informed of the Doctor's return, and a helicopter is sent to his country home to collect him.

At the Gore Crow hotel, the Doctor and Ace meet a young woman called Shou Yuing, who shares Ace's love of explosive. Meanwhile, as Bambera stops to examine a certain blue police telephone box at the side of the road, she is caught in the crossfire between two groups of armoured knights, using both swords and futuristic guns.

The Doctor shows interest in a scabbard excavated from the battlefield, which hangs over the mantlepiece in the hotel. The scabbard is hot to the Doctor's touch, and the hotel owner's blind wife, Elizabeth, says she can sense it waiting for something, or someone. Archaeologist Warmsly dates the scabbard to the 8th century, but the Doctor senses that it is far older than that, and has been waiting for something.

The Destroyer (Doctor Who) has not been a contender in any CBUB matches.