The Flyers settled down, scoring twice in the span of a minute to tie the game.
Grossman got the first one, firing a loose puck across the line after a wild net-mouth scramble that had four Penguins piled in the crease, desperately trying to prevent a goal.
Letang tried his best to keep the puck out of the net, stopping the initial shot at the goal line, but it eventually popped out to Grossman, who scored the Flyers’ opening goal 11:49 of the first.
Simmonds scored a minute later, taking a Danny Briere pass and powering his way to the top of the crease where he slid a shot past Vokoun.
Then things got heated between the cross-state rivals and the penalty box quickly filled with three players apiece less than a minute after the tying goal.
Penguins defenseman Deryk Engelland went off for roughing, Flyers forward Brayden Schenn for cross-checking, and unsportsmanlike conduct penalties were also issued while Tanner Glass and Simmonds had a fight.
‘‘I think we got too emotional in the game, too involved with the extra curriculars,’’ Penguins coach Dan Bylsma said.
The teams played a clean second period, combining for just three penalties, but the last one, an elbowing call against the Penguins’ Craig Adams, resulted in Voracek’s go-ahead goal with 9.9 seconds left in the period.
Voracek scored his second of the game 18 seconds into the third period, taking advantage of a miscommunication between Vokoun and Martin behind the net. Braydon Coburn’s shot after the turnover bounced to Voracek, who made it a two-goal game.
Kennedy cut the deficit to one goal at 5:29, putting the rebound from Martin’s point shot behind Bryzgalov before Simmonds’ scored his second of the game at 7:36.
‘‘Obviously we started off pretty rocky, and kind of finished pretty rocky, but I think in between we played a pretty solid game,’’ Simmonds said.
NOTES: Flyers forward Matt Read left the game with an upper-body injury. ... The rivals meet again March 7 in Philadelphia. ... Both teams play next at home against Florida. The Flyers host the Panthers Thursday, while the Pittsburgh welcomes Florida the following night.