Ronan Murray struck his first goal for Plymouth to earn them a vital 2-1 win in the battle for npower League Two survival.
The Ipswich loanee scored from close range three minutes after the break after Barnet's defenders had charged down two shots on the six yard box.
The visitors had taken the lead against the run of play in the 21st minute after player-head coach Edgar Davids swept a pass out to the left and Elliot Johnson cross back into the penalty area was converted by Bees top scorer Jake Hyde.
Plymouth continued to press and were rewarded when skipper Conor Hourihane scored a brilliant 34th minute leveller, beating three players on the edge of the box before letting fly with a superb rising drive into the top corner.
In a nervous finish for both relegation-haunted sides, Argyle's Jake Cole made a vital 79th minute point-blank stop to deny his former club. The keeper's save at the foot of his post denied Bees substitute Iffy Allen, who looked odds-on to score.
Bees keeper Graham Stack then made a superb close-range save to deny Plymouth substitute Gozie Ugwu in stoppage time.