King was part of the Gillingham side that won the 2009 League Two play-off final
Gillingham defender Simon King has joined Plymouth on a one-month loan.
King, 28, will be available for all Argyle's matches up to and including the trip to Crawley Town on 1 October.
King joined Gillingham from Barnet for £200,000 in June 2007, external and was the club's player of the year in the 2008-09 season.
However, he has struggled to get back into manager Andy Hessenthaler's side after suffering a serious ankle injury, external in 2009.
He missed the entire 2009-10 season due to the injury and made just four appearances for the Gills last season.
He has yet to make a start for Gillingham this term.
Argyle are in need of defensive reinforcements after Stephane Zubar quit Argyle last week.
