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In addition to subsequent appearances by both characters in the main programme, this became the basis for another series featuring the two characters, The Sarah Jane Adventures, which debuted in 2007.
K-9 appears only occasionally in the first and second series, and becomes a regular character in series three.
After Brendan attempts to brag about the p H balance of the soil, Tracey sharply comments that gardening is more about respect for nature than scientific theory.
Brendan's curiosity about K-9 is matched only by Sarah's renewed concern over Lavinia's absence.
He decided that a child-orientated spin-off series with K-9 might be just the thing.