Tight end Saubert executed the game-winning two-point conversion for Seattle.
Seattle staged a remarkable fightback to overcome the Rams in extra time, securing their spot in the postseason.
Rallying from a 30-14 hole in the final period, the Seattle squad emerged victorious by a single point at home, registering their fifth consecutive win.
While the Rams had become the first to earn a post-season spot earlier on game day, the Seattle team secured their place to the postseason after a two-year hiatus.
With this outcome, the Seattle have taken over their division's race with a twelve and three record, supplanting the Los Angeles, who fell to the number five seed with an eleven and four standing.
Signal-caller Darnold threw two interceptions but recovered to deliver two touchdown passes, culminating in 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 scoring dash for Seattle.
Los Angeles cornerback Wallace then returned Darnold's initial interception for a big return, leading to a short score by Blake Corum on the next play.
In the final stanza, a scoring pass from Stafford to Nacua extended the Rams' lead to sixteen points, but Rashid Shaheed ignited the comeback with a spectacular return for a score.
Darnold then connected with AJ Barner in the end zone, and a successful two-point play forced the game into overtime.
Although Puka Nacua raced in for his another TD in OT, Jaxon Smith-Njigba responded in kind to set up the decisive score.
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