Do tv shows count? If so, Kevin was in animal house with John Belushi, Who was in SNL with Akroyd.
I can do it a bit longer with just movies:
Animal house with Mark metcalf (Neidermeyer)
Mark was in One Crazy Summer with Joel Murray,
Who was in Scrooged with his brother Bill,
Who was in GhostBuster with Dan Akroyd.
I bet there is a quicker way....
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