Tight end Eric Saubert made the decisive two-point play for Seattle.
The Seattle Seahawks staged a stunning comeback to overcome the Rams in extra time, securing their spot in the NFL play-offs.
Overcoming a sixteen-point hole in the fourth quarter, the Seahawks triumphed 38-37 at home, notching their fifth consecutive victory.
While the Los Angeles had already secured a playoff spot earlier on Sunday, the Seahawks secured their place to the postseason after a 24-month hiatus.
With this result, the Seahawks now lead their division's race with a 12-3 record, replacing the Los Angeles, who dropped to the fifth seed with an 11-4 record.
Signal-caller Darnold had two interceptions but regrouped to deliver two touchdown passes, culminating in the second TD to star receiver Smith-Njigba in the extra period.
The Rams held a 13-7 lead at the break before Kenneth Walker III burst through for a 55-yard touchdown run for the home side.
Los Angeles defensive back Josh Wallace then took back Darnold's initial pick for 56 yards, setting up a short score by Corum on the ensuing snap.
In the final stanza, a scoring pass from Stafford to Puka Nacua extended the Rams' lead to 30-14, but Shaheed ignited Seattle's hope with a 58-yard punt return.
Darnold then found AJ Barner in the endzone, and a successful conversion forced the contest into an extra period.
Although Puka Nacua raced in for his another touchdown in overtime, Smith-Njigba responded in kind to setup the decisive conversion.
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