Tight end Eric Saubert made the game-winning two-point play for the Seahawks.
Seattle engineered a stunning comeback to overcome the Rams in extra time, securing their spot in the postseason.
Overcoming a 30-14 deficit in the final period, the Seattle squad triumphed 38-37 at home, registering their fifth consecutive win.
While the Rams had become the first to earn a post-season spot earlier on Sunday, the Seahawks secured their place to the postseason after a 24-month absence.
With this outcome, the Seattle now lead their division's race with a 12-3 mark, replacing the Rams, who fell to the fifth seed with an 11-4 standing.
Signal-caller Sam Darnold threw two picks but recovered to deliver two touchdown passes, including the tying TD to star receiver Smith-Njigba in the extra period.
The Rams held a six-point lead at half-time before Kenneth Walker III burst through for a long scoring dash for Seattle.
Los Angeles defensive back Wallace then took back Darnold's first pick for a big return, leading to a short touchdown by Blake Corum on the ensuing snap.
In the fourth quarter, a touchdown from Matthew Stafford to Nacua extended the advantage to sixteen points, but Shaheed provided Seattle's hope with a 58-yard return for a score.
Darnold then connected with Barner in the endzone, and a successful conversion forced the contest into an extra period.
Although Nacua raced in for his another TD in OT, Smith-Njigba answered in kind to set up the game-winning score.
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Angela Ryan
Angela Ryan
Angela Ryan