Tight end Saubert made the decisive two-point conversion for the Seahawks.
Seattle engineered a remarkable comeback to overcome the Los Angeles Rams in extra time, securing their spot in the NFL play-offs.
Overcoming a sixteen-point deficit in the fourth quarter, the Seahawks triumphed by a single point at home, notching their fifth straight win.
While the Los Angeles had become the first to earn a playoff berth earlier on game day, the Seattle team booked their return to the postseason after a 24-month absence.
With this result, the Seattle now lead their division's race with a 12-3 record, supplanting the Rams, who fell to the number five seed with an 11-4 record.
Signal-caller Darnold threw two interceptions but recovered to make two scoring throws, culminating in the tying score to wideout Smith-Njigba in the extra period.
The visitors held a six-point lead at half-time before Walker burst through for a long scoring dash for the home side.
Los Angeles defensive back Josh Wallace then took back Darnold's initial interception for 56 yards, setting up a one-yard touchdown by Corum on the next play.
In the final stanza, a scoring pass from Matthew Stafford to Puka Nacua pushed the Rams' lead to sixteen points, but Rashid Shaheed provided the hope with a 58-yard return for a score.
Darnold then connected with Barner in the end zone, and a converted conversion sent the contest into overtime.
Although Puka Nacua scored for his another touchdown in overtime, Smith-Njigba responded in kind to setup the game-winning conversion.
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