Receiver Saubert made the game-winning two-point play for Seattle.
The Seattle Seahawks staged a remarkable fightback to defeat the Rams in overtime, clinching their place in the NFL play-offs.
Rallying from a 30-14 deficit in the final period, the Seahawks triumphed by a single point at home, notching their fifth straight victory.
While the Rams had already secured a post-season berth earlier on Sunday, the Seattle team booked their return to the postseason after a two-year absence.
With this result, the Seahawks have taken over their Conference standings with a 12-3 record, supplanting the Los Angeles, who dropped to the fifth seed with an 11-4 record.
Quarterback Darnold had two picks but regrouped to make two scoring throws, including the second TD to star receiver Smith-Njigba in the extra period.
The visitors held a six-point advantage at half-time before Walker burst through for a long scoring dash for Seattle.
Los Angeles defensive back Josh Wallace then took back Darnold's initial interception for a big return, setting up a short score by Blake Corum on the next play.
In the fourth quarter, a scoring pass from Stafford to Puka Nacua extended the Rams' lead to 30-14, but Rashid Shaheed ignited the hope with a 58-yard punt return.
Darnold then connected with AJ Barner in the endzone, and a successful two-point play sent the game into overtime.
Although Puka Nacua raced in for his another touchdown in OT, Smith-Njigba answered in kind to setup the decisive conversion.
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