David Campbell Junior

David Campbell Junior was the youngest adopted son of David Campbell Senior and his Gallifreyan wife, Susan Campbell.

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He was orphaned in the Dalek Invasion of Earth, and sometime after the human victory, he was adopted by David and Susan. They had already adopted two orphans before him.

David Junior was named after his adopted father. His adopted brother and sister were named after Ian Chesterton and Barbara Wright, who were both former companions of Susan's grandfather, the Doctor.