The Vikings embraced the spoiler's role in the NFC North, delivering a potential knockout blow to Chicago's playoff hopes with a dramatic comeback victory at the Metrodome.

Blair Walsh's 34-yard field goal with 1:43 remaining in overtime ended a wild back-and-forth slugfest that featured 976 combined yards of offense.

Walsh bailed out Rhett Ellison, whose facemask penalty negated what would have been Walsh's 39-yard game winner earlier in overtime. Walsh eventually missed from 57 yards. But Bears kicker Robbie Gould also missed from 47 yards on Chicago's next possession.

Retread quarterback Josh McCown shredded Minnesota's pass defense for 355 yards -- including a Bears' record 249 to wide receiver Alshon Jeffery.

But the Vikings erased a 10-point fourth-quarter deficit when back-up quarterback Matt Cassel threw an 8-yard touchdown pass to Greg Jennings and Walsh converted a 30-yard field goal with 20 seconds remaining to force overtime.