A very successful junior hockey player with the London Knights, he won two gold medals as part of the men's junior national team in 1994 and 1995 and was the Ontario Hockey League's 1994 winner of the Red Tilson Trophy as the league's most outstanding player.

He played for the men's junior national team in both the 1994 and 1995 championships winning gold medals both times.

[3] He struggled to break into the Capitals lineup and was demoted to team's American Hockey League affiliate, the Portland Pirates.

[7] Allison saw a resurgence with the Bruins, putting up a then career-high 83 points in the 1997–98 season, the ninth highest total in the league.

The Bruins traded Allison, now a fan favourite in Boston, to the Los Angeles Kings with Mikko Eloranta for Jozef Stumpel and Glen Murray on October 25, 2001.

[14] The 2004–05 season was cancelled by a labour dispute[15] and Allison did not receive a qualifying offer from the Kings in 2004 allowing him to become an unrestricted free agent.

[16] Prior to the 2005–06 season, Allison signed a one-year contract with the Toronto Maple Leafs worth $1.5 million, with bonus incentives for good performance.

[19] Allison subsequently did not sign with a team for the 2006–07 NHL season, as he wanted to be near his family and no situation arose where he could.

The training camp invite yielded a memorable moment, when Allison fought with the Philadelphia Flyers' Darroll Powe during an exhibition game and ripped his helmet in half with his bare hands.

[25] Variety and Deadline in 2018 reported that Allison and his company Don Kee Productions were one of fourteen executive producers on the film Arkansas.