That's going to be tough but with the power and glory of the internet I can get us there:

The Cast of Lost:

Dominic Monaghan was in "Monsignor Renard"

with

John Thaw who was in "Pretenders"

with

Fredrick Yeager who was in "Song of Norway"

with

Florence Henderson who was in "Mom's on Strike"

with

Tim Matheson who was in "Animal House" with..
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You guessed it:
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Wait for it
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KEVIN BACON - TADAAAAAAA!