Tight end Eric Saubert executed the game-winning two-point conversion for Seattle.
Seattle staged a remarkable fightback to overcome the Los Angeles Rams in extra time, securing their place in the postseason.
Rallying from a sixteen-point hole in the final period, the Seahawks triumphed by a single point at home, registering their fifth straight victory.
While the Los Angeles had already secured a post-season spot earlier on Sunday, the Seattle team secured their place to the postseason after a two-year absence.
With this outcome, the Seahawks have taken over their Conference race with a twelve and three mark, replacing the Los Angeles, who dropped to the fifth seed with an eleven and four record.
Quarterback Sam Darnold threw two interceptions but regrouped to make two touchdown passes, culminating in the second TD to wideout Smith-Njigba in the extra period.
The visitors held a six-point lead at half-time before Kenneth Walker III broke free for a 55-yard scoring dash for Seattle.
Los Angeles cornerback Josh Wallace then took back Darnold's initial pick for a big return, leading to a one-yard score by Corum on the ensuing snap.
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 AJ Barner in the end zone, and a successful two-point play sent the game into overtime.
Although Puka Nacua scored for his second TD in OT, Jaxon Smith-Njigba answered in kind to setup the game-winning score.
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