Tight end Eric Saubert made the game-winning two-point play for the Seahawks.
Seattle staged a remarkable fightback to overcome the Los Angeles Rams in overtime, clinching their spot in the postseason.
Rallying from a sixteen-point deficit in the fourth quarter, the Seattle squad emerged victorious 38-37 at home, notching their fifth straight victory.
While the Rams had become the first to earn a post-season spot earlier on game day, the Seahawks secured their place to the postseason after a two-year hiatus.
With this outcome, the Seattle now lead their Conference standings with a 12-3 record, supplanting the Rams, who fell to the number five playoff position with an 11-4 standing.
Signal-caller Darnold threw two interceptions but regrouped to deliver two touchdown passes, culminating in the tying score to wideout Jaxon Smith-Njigba in the extra period.
The Rams held a six-point lead at half-time before Walker burst through for a 55-yard touchdown run for Seattle.
Rams defensive back Josh Wallace then took back Darnold's initial pick for 56 yards, leading to a short score by Corum on the ensuing snap.
In the final stanza, a touchdown from Stafford to Puka Nacua extended the advantage to sixteen points, but Rashid Shaheed provided Seattle's comeback with a spectacular return for a score.
Darnold then connected with Barner in the end zone, and a converted two-point play forced the contest into an extra period.
Although Nacua scored for his another touchdown in OT, Jaxon Smith-Njigba answered in kind to set up the game-winning conversion.
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