Tight end Saubert made the decisive two-point play for Seattle.
Seattle engineered a stunning fightback to defeat the Rams in extra time, securing their place in the postseason.
Rallying from a 30-14 hole in the fourth quarter, the Seattle squad triumphed by a single point at home, notching their fifth consecutive victory.
While the Rams had become the first to earn a playoff berth earlier on game day, the Seahawks secured their place to the postseason after a 24-month hiatus.
With this outcome, the Seahawks have taken over their Conference race with a twelve and three record, replacing the Rams, who fell to the fifth seed with an eleven and four record.
Quarterback Darnold had two picks but regrouped to deliver two touchdown passes, including the second TD to wideout Smith-Njigba in the extra period.
The Rams held a six-point lead at the break before Walker broke free for a long touchdown run for Seattle.
Los Angeles defensive back Wallace then took back Darnold's initial pick for 56 yards, setting up a one-yard touchdown by Corum on the next play.
In the fourth quarter, a scoring pass from Matthew Stafford to Puka Nacua extended the Rams' lead to sixteen points, but Shaheed ignited Seattle's comeback with a spectacular punt return.
Darnold then connected with AJ Barner in the end zone, and a successful two-point play sent the game into overtime.
Although Puka Nacua scored for his another touchdown in overtime, Smith-Njigba answered in kind to setup the decisive score.
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