With the episode "Sibling Rivalry", 'Family Guy' helped bring 'The Sopranos' into the Tooniverse, thanks to an appearance by Christopher Moltisanti.
The connection became a little bit stronger (but only a little) the following week in the episode "Brian Sings And Swings", which featured the vocal talents of Frank Sinatra Jr. as himself.
The League of Themselves member and "Member Of The Board" also portrayed himself in an episode of 'The Sopranos', in which he joined a floating card game.
Not exactly a strong case for 'The Sopranos' in cartoons, but I'm not going to hold my breath waiting to see Tony Soprano muscle in on Skeletor's territory for the waste management contracts on Eternia.
What'll be up next for the Son of Ol' Blue Eyes in the Tooniverse?
How about Frank Sinatra Jr. Meets Frankenstein Junior and the Impossibles?