Jordan Chapell scored a brace as Torquay registered their first win of the season at Northampton.
Forward Jacob Blyth had headed the hosts into the lead from Danny Emerton's deep cross.
The visitors levelled on the counter attack after Karl Hawley played in Chapell to slot past Cobblers keeper Matt Duke.
Chapell won it when he latched on to Callum Ball's pass, went past defender Joe Widdowson and fired in.
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