McDavid gave Edmonton a 1-0 lead at 5:21 of the second period. Draisaitl skated with the puck from his own end into the offensive zone and fed McDavid, who scored on a backhand.
McCann tied it 1-1 at 7:20 when a rebound of Jordan Eberle’s shot went off his shin pad and past Skinner.
Bellemare gave Seattle a 2-1 lead at 9:24 on a redirection of Vince Dunn’s wrist shot from beyond the left face-off circle.
Wennberg made it 3-1 with his first goal of the season at 17:21, pouncing on a rebound in front after Skinner made an initial save against Eeli Tolvanen.
The Kraken outshot the Oilers 15-7 in the second. They finished 0-for-5 on the power play; Edmonton was 0-for-3.
“We played a [heck] of a hockey game,” Seattle coach Dave Hakstol said. “We played the way we exactly wanted to play on the road. Giving up the second one obviously gives them a little bit of juice and a little bit or momentum. We worked pretty hard all the way through the game today, and it all comes down to the tying goal.
“It’s disappointing without question because of how hard our players worked. It was a pretty solid road game that they played.”
NOTES: Kane became the third player in Oilers history to complete a hat trick in OT, joining Kelly Buchberger (Jan. 31, 1993) and Esa Tikkanen (Game 7 of Smythe Division Semifinals on April 16, 1991). … Hyman scored a hat trick against the Kraken in a 4-1 win at Seattle on Saturday. … It was McDavid’s 47th game-opening goal, passing Wayne Gretzky for fourth on Edmonton’s all-time list. Ryan Smyth leads with 61. … Eberle had an assist and two shots on goal in 17:22 of ice time; he missed three games after his leg was cut by a skate blade during practice Nov. 8. … Tolvanen had an assist and a game-high seven shots.