Receiver Eric Saubert executed the game-winning two-point conversion for Seattle.
Seattle staged a stunning comeback to defeat the Rams in overtime, clinching their spot in the postseason.
Rallying from a 30-14 deficit in the fourth quarter, the Seattle squad emerged victorious by a single point at home, notching their fifth straight win.
While the Rams had become the first to earn a playoff spot earlier on game day, the Seahawks booked their return to the postseason after a two-year hiatus.
With this outcome, the Seattle have taken over their division's race with a 12-3 mark, supplanting the Rams, who fell to the fifth playoff position with an eleven and four standing.
Quarterback Darnold threw two interceptions but recovered to deliver two scoring throws, culminating in the second score to star receiver Jaxon Smith-Njigba in the extra period.
The Rams held a six-point lead at the break before Walker burst through for a 55-yard touchdown run for Seattle.
Los Angeles defensive back Wallace then took back Darnold's first interception for a big return, leading to a short score by Blake Corum on the next play.
In the final stanza, a touchdown from Stafford to Nacua pushed the Rams' lead to 30-14, but Shaheed provided Seattle's hope with a 58-yard punt return.
Darnold then found AJ Barner in the endzone, and a successful conversion sent the game into overtime.
Although Puka Nacua raced in for his second touchdown in overtime, Jaxon Smith-Njigba responded in kind to set up the game-winning score.
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