Only once in NHL All Star Game history has a fight ever broke out.
This was the second official NHL all star game. In the first game in 1947, Chicago scoring star Bill Mosienko badly hurt his ankle, causing much controversy regarding the All Star game. As a result, most players tended to avoid physical play, a tradition was has grown ever more tranquilly to this very day.
And I guess it would not surprise you that Gordie Howe is the NHL's most penalized player in All Star game history, serving 25 minutes in 23 games. Mortson, ranks second with 21 minutes in just 9 games.
By The Way: Howe and Mike "Shakey" Walton got into quite the altercation in the 1968. The two jousted with their sticks and then dropped their gloves and sort of bear-hugged each other. The linesemen stepped in very quickly before either player could get their fists loose. As a result both Howe and the normally peaceful Walton both got just 2 minutes for roughing.