Mainstream credits: Happy Days (1975, 1976), Wonderbug (1976-77)
Adult credits: The Devil in Miss Jones 3: A New Beginning (1986), New Wave Hookers (1986)
Circumstance: Mainstream actor turned adult film star
The late Jack Baker, who died in 1994, seemed to be doing perfectly well as a working TV actor in the mid-'70s. He played Sticks the Drummer on a memorable episode of Happy Days, and also appeared on M*A*S*H and The Jeffersons. And a whole generation of children got to know him from the trippy Krofft Super Show, where he played C.C. McNamara in the "Wonderbug" segments, and later on the spinoff Wonderbug series.
His adult film career—we're talking real porn, none of this Skinemax stuff—started with the 1984 releases Hot Chocolate, Coffee & Cream, and Chocolate Candy. Sounds delicious.