- It becomes the highest scoring game in Champions League history, overtaking Monaco 8-3 Deportivo
- Shinji Kagawa scores twice in space of 60 seconds in a crazy encounter at the Westfalenstadion on Tuesday
- The Japanese scored two goals in the space of 60 seconds to rule out Aleksandar Prijovic's opener
- Defensive errors at both ends of the pitch saw five goals scored in the opening 29 minutes of the game
- Borussia Dortmund stay top of Group F but Real Madrid close behind after late win against Sporting Lisbon
Rampant Dortmund netted five times in 15 first-half minutes with Shinji Kagawa grabbing two goals while Reus, back for the first time after six months out injured, completed the scoring in stoppage time.
Dortmund are top of Group F on 13 points, two points ahead of Real Madrid, who beat Sporting 2-1 away, with the two sides meeting in Spain in December to decide who takes top spot in the section.
Marco Reus capped his return from a long-term injury by scoring a hat-trick while Ousmane Dembele scored one goal
Nuri Sahin scored Borussia Dortmund's third and the fourth goal of the night in the 20th minute after a goalkeeping mistake
Reus plans to get his match ball signed by his team-mates after announcing his return from injury in the best way possible
The 12 goals scored between Borussia Dortmund and Legia Warsaw breaks a 13-year Champions League goal-scoring record
'I was just happy to be there from the start,' Reus, who missed the 2014 World Cup and Euro 2016 because of injury, told reporters.
'It is how you imagine your perfect comeback.
'I waited a long time for this and so it is even sweeter. The ball will be signed by everyone and will go on the shelf.'
With the 27-year-old Reus named captain and coach Thomas Tuchel resting key players following their league win over Bayern Munich on Saturday, Dortmund took control from the start.
But it was the visitors who struck first with Aleksandar Prijovic brilliantly curling in his shot with the outside of his foot in the 11th minute.
Their lead, however, lasted only six minutes with Kagawa nodding in Oussmane Dembele's low cross at the far post as Dortmund began their goal bonanza.
The Japanese grabbed his second goal a minute later and Nuri Sahin, making only his second appearance this season, got on the scoresheet after goalkeeper Radoslaw Cierzniak punched a Reus free kick straight onto the midfielder's chest in the 20th minute.
Prijovic got his second of the evening in the 25th minute and could have levelled when he chipped the ball onto the crossbar a minute later.
Two goals in three minutes from Dembele and Reus wrapped up a frenzied first half.
Aleksandar Prijovic watches as his curled effort gives Legia Warsaw a surprise lead with a fine strike after 10 minutes
Shinji Kagawa ruled out Legia Warsaw's opener in the 17th minute after latching onto French teenager Dembele's pass
Kagawa took only 60 seconds to give Dortmund the lead when he took advantage of lax defending to score his second goal
Sahin soon added a third after Warsaw goalkeeper Radosław Cierzniak calamitously failed to deal with Reus' free-kick
Prijovic would add another goal 14 minutes later, by which time Borussia Dortmund had already scored three times
|22/11/2016||Borussia Dortmund||8-4||Legia Warsaw||12|
|05/11/2003||Monaco||8-3||Deportivo de La Coruña||11|
Reus picked up where he left off after the break, tapping in for his second goal in the 52nd minute with Legia's Michal Kucharczyk pulling one back yet again for the visitors.
The teams traded blows once more with Legia's Nemanja Nikolic scoring two minutes after Felix Passlack had headed in Dortmund's seventh goal.
Reus ended the goalfest with his third in stoppage time for the record-breaking 12th goal of the game.
Borussia Dortmund's final group game will be much more important and difficult than this encounter with their trip to the Bernabeu set to decide who tops Group F. Real Madrid must win to overhaul the Bundesliga stars while Dortmund need only a draw to seal a bigger chance of an easier Round of 16 draw.
Dembele, who also created three goals, showed neat footwork in the penalty box to score the fifth goal of the evening
The captain Reus scored the first of his three goals after 32 minutes to give Borussia Dortmund a 5-2 lead at half-time
Reus gets the scoring off again seven minutes into the second-half after a fine Dembele pass leaves him with a simple tap in
Legia's Michal Kucharczyk gets in behind Felix Passlack to reduce the deficit to 6-3 with 33 minutes remaining on the clock
Passlack atoned for his earlier error by rising to meet Andre Schurrle's cross after find himself unmarked in the Legia box
Legia Warsaw substitute Nemanja Nikolics fires their fourth goal just two minutes after Passlack's headed effort
Reus scored his third goal and the 12th of the match two minutes into injury time to rewrite Champions League history books
Reus' goal took the game beyond Monaco 8-3 Deportivo to become the highest scoring game in Champions League history
The Borussia Dortmund players salute the Yellow Wall following a record-breaking evening at the Westfalenstadion