Just as it was against the Sabres, Florida dominated the third period to force the extra frame, both outshooting (14-5) and outscoring (1-0) New York over the final 20 minutes of regulation.
"The third period, again, we battled back," Panthers captain Aleksander Barkov said. "We've got to learn to play the way we played in the third period. How we battled back, that needs to be our 60-minute game."
Unveiling a few new-look lines to start the game, Denis Malgin, who moved up from the third to second line, broke the ice against the Islanders, connecting on a one-timer to give the Panthers an early 1-0 lead at 5:34 of the first period - an advantage they carried into the first intermission.
In the second period, the Islanders answered back. Anders Lee tied the game at 5:40, receiving a pass from behind the net and scoring on a bar-down wrist shot from the slot to even things up at 1-1. At 17:31, Josh Bailey roofed a shot on an odd-man rush to put New York on top at 2-1.
At 13:58 of the third period, Evgenii Dadonov scored to make it 2-2 to get the game to overtime.
Following a heart-stopping, but scoreless extra frame the game went to a shootout, where Brock Nelson was the only man to score a goal for either team, securing the 3-2 final for the Islanders.
In net, rookie Sam Montembeault made his first start and second appearance of the season for the Panthers, stopping 26 of 28 shots. For New York, Semyon Varlamov turned aside 35 shots.
"He looked great," Panthers coach Joel Quenneville said of Montembeault. "He handles the puck well. He has a lot of confidence in the net. He sees plays around the net, anticipates well. He was good."
The Panthers currently sit at 1-2-2 on the season.
Here are five takeaways from Saturday's loss on Long Island…