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NBC, Eric McCandless/ABC via Getty Images, Adam Taylor/ABC via Getty Images
Before he was Huck on Shonda Rhimes' twisty political thriller, Guillermo Diaz booked a 1995 episode of ER for what would be one of his earliest TV roles. And before they were the devious Cyrus Beene and Jake Ballard, respectively, Jeff Perry and Scott Foley popped up on Rhimes' first ABC series. Perry famously played Meredith's estranged father Thatcher, while Foley guested as Henry, the ill-fated husband of Kim Raver's Teddy Altman.