Scottish League Cup holders St Mirren staged a remarkable four-goal comeback to all but end East Kilbride’s hopes of qualifying from the group.
Mick Kennedy’s third-tier side raced out to a stunning three-goal lead, with Cami Elliott’s first-half brace followed by Craig McGuffey’s penalty.
But the top-flight hosts responded almost immediately with a penalty of their own, converted by summer newcomer Eseosa Sule.
Ryan Carr then cut East Kilbride’s lead to one goal before Killian Phillips equalized in a thrilling group game.
In a thrilling contest leading to a penalty shoot-out with bonus points, Malik Dijksteel needed the third minute of stoppage time to complete St Mirren’s incredible comeback.
If the Premier League club avoid defeat at home to second division Dunfermline Athletic on Saturday, they will be crowned Group C winners.