Marchand scored the deciding goal before Sergei Bobrovsky stopped Mikko Rantanen in the third round of the shootout to seal the win. Rantanen scored with 2:41 remaining to tie it 3-3 and force overtime, coming in from behind the net and redirecting a long pass from Sam Steel that beat Bobrovsky.
Marchand left the Panthers this week to return home to Halifax, Nova Scotia, to be with longtime friend JP MacCallum whose 10-year-old daughter Selah MacCallum died last Friday at 10 years old from cancer.
Sam Reinhart scored his 300th NHL goal for the Panthers (6-5-1), who have won three of five. Bobrovsky made 19 saves.
Rantanen had a goal and an assist, Steel had three assists and Wyatt Johnson also scored for the Stars (6-3-3), who have lost two straight and had their five-game point streak end (3-0-2). Casey DeSmith made 25 saves.
After a scoreless first period, Marchand gave the Panthers a 1-0 lead 1:48 into the second.
Anton Lundell got the Panthers going off the rush with Eetu Luostarinen finding Marchand at the blue line. Marchand rolled into the zone and scored off a wrist shot.
When he scored, Marchand pointed toward the sky.
Reinhart made it 2-0 at 4:02 of the second, nearly deflecting a point shot from Evan Rodrigues, only the puck went off the goal cage.
Carter Verhaeghe tracked down the puck and took a shot that DeSmith stopped, but Reinhart got to the rebound and scored on a sharp-angle shot from the goal line that hit DeSmith on the left pad before going behind him and in.
Dallas got a four-minute power play at 13:25 of the second when Seth Jones caught Justin Hryckowian in the nose with his stick.
Dallas then scored twice in a 14-second span to tie it.
Johnson scored Dallas’ first goal of the power play at 14:47 to make it 2-1, scoring on a one-timer from the left face-off circle coming in off the rush with Steel.
Just 14 seconds later, Hryckowian tied it 2-2 with his first NHL goal when he got in front of the net and popped a pass from Thomas Harley over Bobrovsky and in.
Bennett put Florida back ahead 3-2 at 12:26 of the third. Bennett went to the net and a shot from Gustav Forsling hit him in the skate down low, and he was able to pull in the puck and put a backhanded shot past DeSmith for the lead.