Receiver Eric Saubert executed the decisive two-point play for Seattle.
The Seattle Seahawks engineered a remarkable fightback to overcome the Rams in extra time, securing their spot in the postseason.
Overcoming a 30-14 deficit in the fourth quarter, the Seahawks triumphed by a single point at home, registering their fifth consecutive victory.
While the Los Angeles had become the first to earn a post-season spot earlier on Sunday, the Seahawks secured their place to the postseason after a two-year hiatus.
With this outcome, the Seahawks now lead their division's race with a twelve and three mark, replacing the Los Angeles, who dropped to the number five seed with an 11-4 standing.
Signal-caller Darnold had two picks but recovered to deliver two touchdown passes, culminating in the second TD to star receiver Jaxon Smith-Njigba in overtime.
The Rams held a 13-7 advantage at half-time before Kenneth Walker III broke free for a 55-yard touchdown run for Seattle.
Los Angeles cornerback Wallace then returned Darnold's initial pick for 56 yards, setting up a short score by Blake Corum on the next play.
In the final stanza, a touchdown from Stafford to Puka Nacua extended the advantage to sixteen points, but Rashid Shaheed provided Seattle's comeback with a spectacular return for a score.
Darnold then connected with Barner in the end zone, and a converted two-point play sent the contest into overtime.
Although Nacua raced in for his another TD in overtime, Smith-Njigba answered in kind to set up the decisive score.
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