The one day international between England and Sri Lanka ended in a tie at the Trent Bridge.
Chasing 287, Jos Buttler's 93 and Chris Woakes's unbeaten 95 helped the hosts recover from 30-4 and 82-6.
Their innings looked to have been in vain until number 10 Plunkett launched Nuwan Pradeep's last ball down the ground and into the stand.
Angelo Mathews scored 73 and Seekkuge Prasanna 59 in Sri Lanka's 286-9.
Team Sri Lanka remain without a victory against England on this tour, having lost the three-Test series 2-0.
The next match of this five-game ODI series is at Edgbaston on Friday.