Yet, they will play under the same iconic roof of what was KeyArena and originally the Seattle Center Coliseum, a place with a rich history that includes a lot of hockey and even a little of the NHL going back to the beginning.
The first sporting event under that roof was a hockey game, an exhibition between the Seattle Totems of the former professional Western Hockey League and the three-time defending Stanley Cup champion Toronto Maple Leafs on Sept. 30, 1964, and hundreds of hockey games were played there afterward.
Climate Pledge Arena will be the best of both worlds, state of the art but with an old soul.
"Every time I think about the first home game, I feel like I just drank a few triple espressos," said Dave Eskenazi, a Pacific Northwest sports aficionado and memorabilia collector, who went to games at the Coliseum as a kid and will be in the stands Saturday. "Lots of energy. I can't wait. I really can't."
Seattle Center is a 74-acre, park-like campus of cultural attractions downtown. Much of it was built for the 1962 World's Fair, including its signature structures: the Space Needle, the 605-foot tower that defines the city skyline, and the arena roof shaped like a pyramid close to the ground.
The original subterranean arena was a hub of activity -- sports, concerts, roller derby, you name it -- and most famous as the home of the Seattle SuperSonics of the NBA for stretches.
"If you've lived in Seattle, you've been to any one of dozens of events in that building," said Jeff Obermeyer, founder of
Seattle Hockey Homepage
and author of three books on Seattle hockey history. "It's where everything big happened that wasn't a stadium event."
But first, it was a hockey barn with a capacity of 12,700.