The Chargers got all the way down to Washington's 1-yard line in the final seconds of the fourth quarter, but was forced to kick the game-tying field rather than score a game-winning touchdown after an incredible defensive stand by the Skins.
Washington won the coin toss in OT and took the ball 78 yards down the field to win the game and advance to 3-5 on the season.
The Skins got off to an incredible start in this one, driving the ball 92 yards from their own 1-yard line on their first possession.
Unfortunately, they needed 99 yards for a touchdown and Kai Forbath's 25-yard field goal attempt was blocked.
Washington's next possession also started from the 1-yard line but instead of a long drive, Robert Griffin III had his pass tipped in the end zone and intercepted by Sean Lissemore to give San Diego a 7-0 lead.
That was Griffin's only error of the game although it wasn't really his fault.
He was actually very accurate throughout the day going for 291 yards and that one intercepiton on 23-for-32 passing.
Washington would bounce back later in the second quarter with an interception of their own by E.J. Biggers.
Philip Rivers was looking for Vincent Brown who broke his route to the sideline as Rivers was throwing inside and the ball went straight to Biggers.
Washington capitalized on the turnover in four plays, highlighted by a 26-yard run by Alfred Morris who eventually punched the ball into the end zone from 5 yards out to tie the game up.
Morris rushed for a season-high 121 yards on 25 carries.
Philip Rivers came back after the interception to orchestrate an 11-play, 85-yard drive before the half.
The Chargers took a 14-7 lead on a screen to Eddie Royal who took it 15 yards for the score.
Washington matched that drive on the back side of the half, starting the third quarter much like they did the first.
This time around however, they finished it with a 1-yard touchdown run by Darrel Young to tie the game up once again.
The biggest play of that 84-yard drive was a one handed grab Pierre Garçon made, reaching around the defender, Derek Cox, while falling to make the 38-yard reception.
On Washington's next possession, it was Garçon again on the other end of a 32-yard pass from Griffin.
Garçon caught 7 passes for 172 yards
Ironically enough, it was Garçon who said the Skins "suck at passing" following their loss last week to the Denver Broncos.
Whether or not he was criticizing his quarterback is unclear but he couldn't criticize Griffins effort in this game, especially three plays later when Griffin scrambled for 10 yards on a third-and-nine launching his body into the air like an Olympic high jumper to get the first down.
The drive would result in another one-yard touchdown run for fullback Darrel Young, giving Washington a 21-14 lead.
Then, a 47-yard Kai Forbath field goal gave Washington a two score lead seemingly putting the Chargers away midway through the fourth quarter, but San Diego came charging back.
The Chargers went 77 yards on the ensuing possession to score a touchdown on a 16-yard pass from Rivers to rookie Keenan Allen.
Allen led the Chargers in receiving with 128 yards on 8 receptions.
And on the Chargers next possession they went for 70 yards down the field - but that is where Washington made their biggest defensive stop of the season.
San Diego had 3 plays from the 1-yard line to try and win the game and they couldn't get it in.
Once they kicked the game-tying field goal, their overtime fate was sealed.
It was none other than Darrel Young who scored the game-winning touchdown for Washington in the extra period, this time a four-yard run.
Young's three touchdowns matched his career total coming into the game.