This was not the start that Argyle hoped for upon the resumption of their EFL Youth Alliance season as three second half goals sent them crashing to defeat in Wiltshire.
The young Pilgrims entered their Christmas break on a four-game unbeaten run, and thoughts of extending that record were very much alive as they went into the half-time break leading 1-0.
They required just 10 minutes to make the breakthrough, as Oscar Halls headed a corner back across goal for Rhys Shirley to apply the finishing touch from close range.
The home side spurned a great chance to level on the half hour, as Argyle goalkeeper Tyler Coombes dived low to his right to save a penalty after Jeremiah Medine had transgressed in the area.
However, the Greens’ hopes of holding on to their lead quickly evaporated in the second half, with Swindon equalising on 48 minutes and then taking the lead shortly afterwards.
Argyle rang the changes in search of a leveller, pushing the hosts back, but they were caught on the break with a late third.
Argyle: Tyler Coombes, Oscar Halls (Ali Mansaray 85), Ethan Mitchell, Brandon Pursall, Oscar Rutherford (Jeffery Forkuo 60), Carlo Garside, Angel Waruih, Charlie Miller (Will Jenkins-Davies 60), Jeremiah Medine (Jamal Salawu 60), Rhys Shirley, Oscar Massey. Substitute not used: Lewis Moyle.