A whopping 48 quarterbacks have taken the field during the regular season.
First-string passers are lost every year, but this campaign has been marked by a handful of backups who have stepped in and made a difference. In some cases, guys who were nobodies in September have materialized as better options than the men they replaced.
Here's a look at four signal-callers who have captured our attention in 2013:
Kubiak argued his young passer was struggling with in-game audibles against the Oakland blitz, but Keenum showed well against Kansas City's pass rush and Arizona's aggressive front. Why yank him against the Raiders?
It's unfair to expect perfection from a quarterback after four starts. Keenum has struggled at times with ball security, but he's made plays facing a higher percentage of pressure on his 141 dropbacks than any passer in the league, according to Pro Football Focus. Keenum's flung eight touchdown passes to only one pick along the way and shown a knack for escapability that Schaub can only fantasize about:
It hasn't been an easy stretch for Kubiak, but he did more harm than good pulling Keenum, who we see a viable quarterback of the future in Houston.
Harrison: Week 12 Power Rankings
McGloin's arm is livelier than Pryor's and -- not unlike Keenum -- his knack for finding targets downfield expands the scope of Oakland's offense. His 18 completions included four strikes of 20-plus yards, including this pretty 26-yarder to Mychal Rivera:
This season's Chicago Bears are a classic example of what sound coaching can do for your starter ... and the guys behind him.
Crisp passes, quick decisions, good pocket movement and production downfield have characterized his play over four appearances. McCown's numbers -- five touchdown passes, zero picks and a completion percentage of 60 percent -- speak to the passer's strong in-game choices. On a rain-soaked, battered field against the Ravens, McCown delivered:
Hitching your wagon to a 34-year-old career backup doesn't make long-term sense, but we'll find out how Trestman truly feels about his starter when Cutler's contract expires after the season. The bigger takeaway here? Chicago arguably has hired the best passing teacher in the NFL.
"I'll say this, our big-play production -- nine explosive plays on offense -- I have never seen a quarterback hit all his big throws like that in a game," McCarthy said, per the Milwaukee Journal Sentinel. "That was the most impressive big-play, big-pass play production from a quarterback. ... I was talking to Scott and going through his grading session this morning and I can't think of another time in my career that I've had someone hit every one."
The Packers desperately need a win, something Tolzien hasn't delivered, but they've found a young passer to groom. That alone makes him a better option than Seneca Wallace.