The Bruins and Flyers have never played in the same division, but these two teams have an intense rivalry between them that has been built up over the years.
The Bruins are an Original Six team with a strong winning tradition, while the Flyers have been one of the most successful NHL teams since they entered the league with the "Second Six" in 1967.
The rivalry heated up in the 1970s when these two teams were among the best and toughest in hockey. It got more intense again in the last 10 years when, again, these two teams got in each other's way in the playoffs year after year.
Some great names have graced this rivalry, names like Bobby Orr, Bobby Clarke, Bernie Parent, Gerry Cheevers, Phil Esposito, Bill Barber, Eric Lindros, Terry O'Reilly, Dave Schultz and Tim Thomas.
Here is a look back at the greatest moments in the often intense rivalry between the Boston Bruins and the Philadelphia Flyers.
The Philadelphia Flyers became the first-ever expansion team to win a game in the Stanley Cup Finals when they beat the Bruins 3-2 in overtime of Game 2 in 1974.
Flyers captain Bobby Clarke scored the game-winning goal at 12:01 of overtime, and the goal is shown in the video on this page. Dave Schultz and Bill Flett got the assists.
The Flyers were the first expansion team to reach the Finals since 1970. The Blues had reached the Finals in 1968, 1969 and 1970 but were swept in all three series.
This win showed the Flyers were going to play the Bruins tough, and the series headed back to Philadelphia all tied at 1-1.
On May 19, 1974, the Philadelphia Flyers became the first expansion team ever to win a Stanley Cup, defeating the heavily favored Boston Bruins 4-2.
The Flyers pulled out all the stops in their attempt to win the series at home. The home team almost never lost when a recording of Kate Smith singing "God Bless America" was played before the game instead of the national anthem. Before this game, the Flyers brought Smith to sing the song in person at the Spectrum.
Game 6 was a 1-0 thriller with Bernie Parent making 30 saves to earn the shutout.
Rick MacLeish deflected a shot by Andre "Moose" Dupont at 14:48 of the first period for the only goal of the game.
In the third period, the Flyers did a good job of containing Bobby Orr and the Bruins, limiting Boston to just five shots on goal.
Philadelphia went crazy as the Flyers won their first Stanley Cup.
The Flyers and Bruins now had an intense rivalry going, and these two teams were both among the league's toughest and most physical in the 1970s.
Whenever the "Big, Bad Bruins" met the "Broad Street Bullies," bad blood was almost guaranteed to ensue.
On January 25, 1976, Dave "The Hammer" Schultz dropped the glove with "The Tasmanian Devil," Terry O'Reilly. These two were natural rivals and fought many times.
But on this night, there was a headbutt resulting in a four-game suspension.
The Flyers and Bruins met in the playoffs for the second time in three years in 1976, this time in the semifinals.
The Bruins took Game 1 in Philadelphia 4-2, and Game 2 went into overtime. Flyers winger Reggie Leach scored after 13:38 in the extra session, and the series was even 1-1.
The Flyers never looked back, winning the next two games at the Boston Garden and ending the series at the Spectrum with a 6-3 win in Game 5.
The victory sent the Flyers to the Stanley Cup Final for the third consecutive year. This time, they were swept by the Canadiens, ending their two-year reign as kings of the hockey world.
In 1977, the two teams met again in the Stanley Cup semifinals.
This time, it was the Bruins who emerged victorious, sweeping the series in four games. Three of the contests were decided by one goal.
The first two games were at the Spectrum, and the Bruins won them both in overtime. Rick Middleton scored the game winner in Game 1, while Terry O'Reilly potted the goal that ended game 2 at 10:07 of double overtime.
When the series headed back to Boston, it was Mike Milbury who scored the tie-breaking goal in the third period in a 2-1 Bruins win in Game 3.
The final game was dominated by the Bruins defense. Goalie Gerry Cheevers made 21 saves to earn the shutout, and Don Marcotte scored twice for Boston.
These two rivals met in the playoffs for the fourth time in five years, and the Bruins evened the ledger by winning this semifinal series in five games.
Game 5 was the final game behind the Flyers bench for coach Fred "The Fog" Shero, who was their coach for both of their Stanley Cup victories.
The only Flyers win in the series came in Game 3 in Philadelphia, but when Boston won Game 4 to take a 3-1 series lead, the Flyers had their backs against the wall as the series returned to Boston.
Peter McNab helped end the Flyers season in Game 5, scoring a goal and adding four assists.
The Bruins headed to the Stanley Cup Finals where they lost for the second straight year to the Montreal Canadiens, this time in six games.
The rivalry between the Bruins and Flyers cooled a bit in the 1980s and 1990s, but by the first decade of the 21st Century, the heat was on once again.
The rivalry intensified after Philadelphia's Randy Jones checked Boston's Patrice Bergeron from behind, causing him to suffer a broken nose and a serious, grade three concussion.
Bergeron missed the rest of the season as a result of his injuries, while Jones earned himself a two-game suspension.
The Winter Classic has quickly become the premier regular-season event of the NHL regular season.
On January 1, 2010, the Flyers and Bruins met at Fenway Park in Boston before 38,112 excited fans.
The Flyers scored first on a goal by Danny Syvret in the second period and held that lead until just 2:18 remained in regulation when Mark Recchi scored a power-play goal to tie the score at 1-1 and send the game to overtime.
The game ended 1:57 into the extra session when Marco Sturm scored his 14th goal of the season to give the home team a 2-1 victory.
The Philadelphia Flyers became only the third team in NHL history to overcome a 3-0 deficit to win a playoff series when they defeated the Bruins in the 2010 Eastern Conference semifinals.
The Bruins seemed to be in control of the series after taking the first two games in Boston and then winning Game 3 in Philadelphia 4-1.
The Flyers got Simon Gagne back from injury, which certainly aided their cause before Game 4, and he came through with the game-winner in overtime in his first game back in the lineup.
Things looked worse for the Flyers in Game 5 when goalie Brian Boucher left the game after a collision in his crease. Backup Michael Leighton came on and finished the shutout in a 4-0 Flyers win that cut Boston's lead in the series to 3-2.
Leighton made 30 saves and lost a shutout with one minute left in regulation in Game 6 as the Flyers won 2-1 to send the series to a seventh and deciding game.
The Bruins jumped out to a quick 3-0 lead in the first period of Game 7, but the Flyers chipped away at the lead and tied it 3-3 by the midway point of the second period.
It was Briere who broke the tie with a power play goal with just 7:08 left in the third period, and the Flyers won the game and the series 4-3.
They became the third team ever and the first team since 1975 to overcome a 3-0 series deficit.
The Bruins got their revenge one year later when they swept the Flyers in four straight games in the second round of the 2011 playoffs.
Game 1 served notice that this year would be different when the Bruins won 7-3. In the series, Boston outscored the Flyers 20-7.
The Bruins went on to sweep the series and win their first Stanley Cup since 1972.