Jack Mitchell's 35-yard field goal with nine seconds left dooms PSU.
Running down the key injuries, good and bad, coming out of the Lions' third loss this year.
With Penn State needing a stop, it was Northwestern that improved its chance to win late Saturday at Ryan Field. s
It wasn't just the Wildcats' ground attack that was good in this Big Ten showdown in Evanston.
Wildcats' defense forces PSU offense into seven 3-and-outs.
Watch PennLive's Bob Flounders and David Jones recap Penn State's 23-21 loss to Northwestern on Saturday.
The sophomore had just 50 rushing yards in last season's meeting between the two schools but ripped off big runs often in Saturday's contest.
Barkley puts up 170 combined yards and scores twice.
Penn State couldn't hold a late lead and a Wildcats field goal in the final seconds wins it.
PSU rallies from 13 down but falls short on a late Wildcats field goal.
For about five minutes in the fourth quarter of the Nittany Lions' game at Northwestern, it appeared they would snatch a rather undeserved win from the hosts. Then, on cue, justice arrived.
The Lions' senior defensive end did not finish the game due to an apparent injury suffered just after his record breaking stop.
Penn State slips to 1-3 on the road this season and the Lions are 3-4 in Big Ten road games during the James Franklin Era.
The Nittany Lions enter this one with momentum, coming off their most complete victory of the season in a 39-0 rout of Illinois.
Northwestern got a key 3-and-out late to set up placekicker Jack Mitchell for redemption in the form of a 35-yard game-winning field goal in the final seconds of a 23-21 win over Penn State.
Specifically, how it will pressure and contain the Wildcats quarterback, Clayton Thorson.
Nelson left the Maryland game with a knee injury.
It's 20-7 in favor of the Wildcats at the break.
Just when Penn State's offense came to life, a special teams letdown handed the first-half momentum back to Northwestern.
Watch as Penn State QB Christian Hackenberg has a pass deflected by the head of a referee in Saturday's game at Northwestern.