When a TV show loses its star, it's a gamble: double down, pivot hard—or roll the dice with a brand-new face. In this episode of A.J. Chat, we’re counting down the 15 worst main character replacements in TV history. Some were sudden. Some were planned. Most were a mess.

From That ‘70s Show to Scrubs, The Walking Dead, Two and a Half Men, The Office, and more—we're breaking down when showrunners got bold… and the audience checked out.

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Because TV fans always notice when the vibe is off—and some of these swaps? Yikes.