As Unai Emery's men trailed 2-0 after their first-leg defeat at the Roazhon Park, the London club rose to the occasion when Pierre-Emerick Aubameyang opened the scoring in the fifth minute.
Pierre-Emerick Aubameyang opened the scoring in the fifth minute then crossed for Ainsley Maitland-Niles to level the tie on aggregate, the Gabon global later scoring a second-half clincher.
He was right as Maitland-Niles doubled the score with his first goal at the Emirates to make it 3-3 on aggregate after he emphatically headed home following a cross from Aubameyang - who grabbed an assist to go with his early goal with barely 15 minutes elapsed. For the Rennes game, Shkodran Mustafi comes into the side in place of the suspended Sokratis, while Petr Cech replaces Bernd Leno in goal, as he has been the regular goalkeeper during cup games for Arsenal this season.
After scoring Aubameyang donned a Black Panther mask to celebrate, and he explained why afterwards.
What does it mean? Well, that was until Aubameyang struck in the second half to complete his brace and extended their lead.
It's not just because you can get to the Champions League through this competition. He should have had a hat-trick, too, missing two late chances to secure the match ball.
Rennes boss Julien Stephan questioned that decision - as well as another possible sending off for Lacazette in north London and Aubameyang being offside for the crucial second Arsenal goal. Having been linked with a move to Arsenal at the end of this season, Sarr did not seize his opportunity to shine, with a hopeful shot in the sixth minute of added time his only notable contribution.