Tight end Eric Saubert executed the decisive two-point conversion for Seattle.
Seattle staged a remarkable fightback to defeat the Rams in overtime, securing their place in the NFL play-offs.
Overcoming a sixteen-point hole in the final period, the Seahawks emerged victorious by a single point at home, notching their fifth consecutive win.
While the Los Angeles had already secured a playoff spot earlier on Sunday, the Seahawks secured their place to the postseason after a two-year absence.
With this outcome, the Seattle now lead their Conference standings with a twelve and three record, replacing the Rams, who dropped to the number five seed with an 11-4 standing.
Quarterback Darnold threw two interceptions but regrouped to make two touchdown passes, including the tying score to wideout Smith-Njigba in the extra period.
The Rams held a 13-7 advantage at half-time before Kenneth Walker III burst through for a long touchdown run for Seattle.
Los Angeles defensive back Josh Wallace then returned Darnold's initial pick for 56 yards, setting up a short score by Corum on the ensuing snap.
In the fourth quarter, a touchdown from Matthew Stafford to Puka Nacua extended the advantage to 30-14, but Rashid Shaheed ignited the comeback with a 58-yard return for a score.
Darnold then connected with Barner in the end zone, and a converted conversion sent the game into an extra period.
Although Puka Nacua raced in for his second touchdown in overtime, Jaxon Smith-Njigba responded in kind to setup the decisive conversion.
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