vintagegeekculture:

The absolute king of the surprising guest star series would have to be Gunsmoke, a Western that was only recently overtaken as the longest-running drama series on television. 

You turn it on, and you might see…hey, Leonard Nimoy as an Indian: 

And…whoa, is that a young Harrison Ford?

And…Gary Busey? 

Richard Dryfuss? 

The late, lamented Adam West: 

Deforest Kelley, with an Abe Lincoln beard: 

Ricardo Montalban: 

Charles Bronson:

Burt Reynolds: 

Jon Voight: 

Jodie Foster: 

And Kurt Russell: 

And many more.