Pageau’s goal came just eight seconds after the Islanders were assessed a minor for too many men on the ice. He won a defensive-zone face-off to himself along the right boards, skated up the ice against the Mitch Marner, and roofed a shot over Akira Schmid’s blocker from the top of the right circle.
Mathew Barzal got the Islanders to overtime by tying it 3-3 at 17:23 of the third period. With Ilya Sorokin on the bench for the extra attacker, Barzal took a short pass from Matthew Schaefer and scored with a one-timer from the top of the left circle.
Schaefer had a goal and an assist, and Jonathan Drouin and Bo Horvat each had two assists for the Islanders (9-6-2), who have won the first three games of a seven-game road trip. Sorokin made 26 saves.
Shea Theodore, Tomas Hertl and Reilly Smith scored, and Schmid made 20 saves for the Golden Knights (7-4-5), who went 1-3-2 on a six-game homestand.
Emil Heineman gave New York a 1-0 lead at 14:03 of the first period. He took a backhand cross-ice pass from Horvat, skated to the top of the right circle, and scored with a wrist shot underneath Schmid’s blocker.
Schaefer made it 2-0 at 17:59, scoring a power-play goal with a point shot through a screen.
Theodore cut it to 2-1 at 18:56 of the second period. He got the puck at the right point, worked his way through Heineman and Ryan Pulock in the right circle and continued toward the net, where he moved the puck to his forehand and stuffed a shot in past Sorokin’s right pad at the left post.
Hertl tied the game 2-2 during a delayed penalty at 8:23 of the third period. He quickly buried a rebound five-hole on Sorokin after Jeremy Lauzon’s initial one-timer from the low slot was stopped.
Smith then gave the Golden Knights a 3-2 lead at 10:45, getting a loose puck along the goal line and lifting a shot over the left pad of a sprawled Sorokin. Islanders coach Patrick Roy challenged the play for goaltender interference, but the call was confirmed after a video review.