With Tom Brady, Aaron Rodgers and Russell Wilson headed to the NFL's conference title games, this is the first time in 21 years — and only second time ever — that three of the final four teams are quarterbacked by a Super Bowl champion. And the fourth quarterback, Andrew Luck, is no slouch, either. Here are five other story lines for Sunday's games:

You again? Both games are rematches from the regular season. The Seahawks beat the Packers 36-16 in the season opener, and the Patriots defeated the Colts 42-20 in Week 11.

Rodgers' calf: No muscle will be as heavily scrutinized as the Green Bay quarterback's left calf. Cheesehead fans have been e-mailing, even calling, the Packers with possible remedies.

Trying to repeat: The Seahawks are attempting to put an end to the longest drought without a repeat champion in nearly 50 years of Super Bowls. The Patriots repeated a decade ago.

Trickeration: What will Patriots coach Bill Belichick devise as an encore after he fooled the Baltimore Ravens last week by using four offensive linemen during one scoring drive?

Trouble against the best: The Colts went 0-4 during the regular season against division champions and 11-1 against everyone else. Luck is 0-3 in his career against the Patriots.