[3] Spence joined the Kings' American Hockey League (AHL) affiliate, the Ontario Reign to begin the 2021–22 season.

[4][5] On March 26, Spence scored his first career NHL goal in a 4–2 win over the Seattle Kraken.

[6] Spence became a full-time member of the Kings in the 2023-24 season, recording 24 points in 71 games.

[7] Spence was born in Manly, New South Wales to a Canadian father, Adam, and a Japanese mother, Kyoko, before moving to Osaka, where he first played baseball, as well as hockey under the tutelage of his father at the age of five, before moving to Cornwall, Prince Edward Island at the age of 13 not knowing any English.

[8][9] Before his 20th birthday he was a dual citizen of Canada and Japan and is fluent in English, French, and Japanese.