Everything pointed to a disappointing and frustrating start to the season for Green Bay as they were down to their hated rivals and also saw Aaron Rodgers get carted off with a left knee injury in the second quarter.
Although noticeably favouring his left leg at times in the second half, Rodgers completed 17-of-23 passes for 273 yards and three touchdowns to key the improbable victory.
The Packers had never before overcome a 17-point fourth-quarter deficit in their 100-year history.
The Packers came out of the locker room with Aaron Rodgers back under center, went to their no-huddle offense and quickly began to wear the Bears pass rush out. He brought the Green Bay Packers back with him.
Green Bay Packers fans didn't need the Steve Miller Band to hope the Packers "Fly Like an Eagle" this season or say "Abracadabra" and reach out and grab a pass or five off of Chicago Bears quarterback Mitchell Trubisky.
It was night and day between the first- and second-half offenses of both teams.
Good things even happened for the Bears when Mack missed. On the next drive, the quarterback churned up 60 yards in nine plays as Cody Parkey finished the drive with a field goal to make it 10-0. McCarthy and the Packers can learn a lot from their incredible comeback against the Bears. Quarterback Mitch Trubisky and coach Matt Nagy will be blamed for the loss, but the Bears' defense broke down after Rodgers returned in the second half. "We had to get adjusted and I think that first couple drives we were trying to do too much".More news: Google's Pixel 3 phone is launching October 9
Rookie Oren Burks is out for the Packers' opener against the Chicago Bears, meaning either the recently acquired Antonio Morrison or Korey Toomer will start in his place at inside linebacker.
He had heavy pressure on Rodgers early in the second quarter which resulted in a sack by Roy Robertson-Harris.
He initially tried to get up, then went back down, and was attended to by trainers.
Prior to exiting Sunday's game, Rodgers was 3-for-7 for 13 yards and was sacked twice.
The Green Bay Packers have not given an official update on the severity of Aaron Rodgers' injury or whether he might be able to return.
Rodgers said he would undergo additional tests on Monday, but "as long as there are no major issues, I'll keep playing".