For a few years in the 1970s, Jimmie Walker was absolutely everywhere. His catchphrase “Dyn-O-Mite!” became so gigantic that it practically swallowed pop culture whole, turning the Good Times star into one of the most recognizable comedians in America. But while audiences assumed Walker would coast into sitcom royalty forever, his real post-Good Times story turned out to be far stranger, quieter, and way more complicated.