Receiver Eric Saubert executed the game-winning two-point conversion for Seattle.
Seattle engineered a remarkable fightback to overcome the Los Angeles Rams in overtime, securing their spot in the NFL play-offs.
Rallying from a 30-14 hole in the final period, the Seahawks triumphed 38-37 at home, notching their fifth consecutive win.
While the Los Angeles had become the first to earn a post-season spot earlier on game day, the Seahawks booked their return to the play-offs after a 24-month absence.
With this result, the Seahawks have taken over their division's standings with a 12-3 mark, replacing the Rams, who dropped to the fifth seed with an eleven and four standing.
Signal-caller Darnold had two interceptions but regrouped to deliver two touchdown passes, including the second TD to wideout Jaxon Smith-Njigba in the extra period.
The visitors held a 13-7 lead at half-time before Walker broke free for a long touchdown run for Seattle.
Los Angeles defensive back Wallace then took back Darnold's first interception for 56 yards, setting up a one-yard score by Blake Corum on the next play.
In the final stanza, a touchdown from Stafford to Puka Nacua extended the Rams' lead to 30-14, but Shaheed ignited the hope with a spectacular return for a score.
Darnold then connected with AJ Barner in the end zone, and a converted two-point play forced the contest into an extra period.
Although Puka Nacua scored for his second touchdown in overtime, Jaxon Smith-Njigba answered in kind to set up the game-winning score.
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