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Notre Dame pulls away from Northwestern to remain unbeaten (2:18)

Ian Book throws two touchdowns and runs for another to power Notre Dame to a 31-21 win over Northwestern. (2:18)

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Book goes untouched for 23-yard TD (0:38)

Ian Book fakes the handoff and runs up the sideline for a 23-yard Notre Dame touchdown. (0:38)

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Book's clutch 2nd half keeps Notre Dame perfect (1:00)

Ian Book totals three touchdowns after halftime as the Irish solidify their presence in the College Football Playoff picture. (1:00)

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Book credits great play calling for win against Northwestern (1:03)

Ian Book gives credit to the Notre Dame coaching staff for setting up plays to free up its playmakers. (1:03)

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Thorson keeps it for 1-yard TD (0:34)

Clayton Thorson QB sneaks up the middle for a 1-yard touchdown, cutting the Northwestern deficit to 24-21. (0:34)

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Northwestern blocks punt deep in Notre Dame territory (0:42)

Cameron Ruiz lays out to block the Notre Dame punt and set up Northwestern at the Irish 17-yard line. (0:42)

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Thorson connects with Lees for 27-yard TD (0:29)

Clayton Thorson finds Riley Lees downfield for a 27-yard Northwestern touchdown. (0:29)

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Notre Dame extends lead with 47-yard TD pass (0:45)

Ian Book connects with Michael Young down the middle for a 47-yard touchdown. (0:45)

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Book connects with Boykin for 20-yard TD (0:45)

Ian Book finds Miles Boykin in the end zone for a Notre Dame touchdown. (0:45)

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Northwestern sideline breaks out dance moves against Notre Dame (0:43)

The Northwestern sideline shows off their dance moves during the first half against Notre Dame. (0:43)

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Northwestern gets on the board with 1-yard TD run (0:39)

Clayton Thorson keeps it up the middle for a 1-yard Northwestern touchdown. (0:39)

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Skowronek makes one-handed snag on Northwestern 4th down (0:29)

Clayton Thorson connects with Bennett Skowronek across the middle who makes the one-handed play to move the chains. (0:29)

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Notre Dame strikes first with 1-yard TD (0:32)

Dexter Williams runs up the middle for a 1-yard Irish touchdown. (0:32)

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Irish fumble handoff on opening drive (0:32)

Blake Gallagher recovers Ian Book's fumble to set up Northwestern in Notre Dame territory. (0:32)