In the annals of TV Tropes, Chuck Cunningham Syndrome represents the tendency some TV shows have to completely disappear a character with no explanation whatsoever. The fella it’s named after, Chuck Cunningham, was the basketball loving older brother of Richie Cunningham om HAPPY DAYS who one day went off to college and was never heard from again. No postcards, no calls to Mr & Mrs C, no visits during winter break. Old Chuck was just wiped out of the show’s continuity. And he is not the only one…from Bub on MY THREE SONS to Judy Winslow on FAMILY MATTERS to Cockroach on THE COSBY SHOW…characters have been getting wiped from a show’s continuity since forever. So I’ve put together a little list of 5 more recent examples of this phenomena.
Crustula 
I think I remember that.
Like Tracy in Coronation Street who vanish to her room to listen to ‘tapes’ a child and emerged years later a teenageer\woman.
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A similar thing sort of happened on US soap opera All My Children where Bobby Martin went upstairs to get his skis and was never heard from again.
Thanks for stopping by and posting, btw.
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On Happy Days Chuck Cunningham
Played by two actors Gavan O’Herlihy and Randolph Roberts was not the only character to vanish from
Happy Days WITH NO EXPLANATION.
HERE IS A LIST OF OTHER CHARACTERS
ON HAPPY DAYS WHO DISAPPEARED
INTO THIN AIR WITH NO EXPLANATION:
BAG ZOMBROSKI:NEIL J. SCHWARTZ
MOOSE : BARRY GREENBERG
EUGENE BELVIN :DENIS MANDEL
MELVIN BELVIN:SCOTT BERNSTEIN
MARSHA SIMMS:BEATRICE COLEN
WENDY :MISTY ROWE
DAPHNE PLAYED BY HILLARY HORA
SPIKE :DANNY BUTCH
KC CUNNINGHAM:CRYSTAL BERNARD
FLIP PHILLIPS :BILLY WARLOCK
TRUDY :TITA BELL
GLORIA :LINDA PURL
STICKS DOWNEY JR :JOHN ANTHONY BAILEY
LEATHER TUSCEDERO :SUZI QUATRO
GOMER PYLE USMC CHARACTERS
WHO VANISHED WITH NO EXPLANATION :
CPL NICK CUCCINELLI PLAYED BY
TOMMY LEONETTI
CPL BOYLE :ROY STUART
SGT WHIPPLE : BUCK YOUNG
PVT FRANKIE LOMBARDI :TED BESSELL
LEAVE IT TO BEAVER
CHESTER ANDERSON : BUDDY HART
TOOEY BROWN : TIGER FAFARA
BILL SCOTT :DAVID KENT
JUDY HENSLER :JERI WEIL
LARRY MONDELLO :RUSTY STEVENS
PETTICOAT JUNCTION
HERBIE BATES :DON WASHBROOK
JUNIOR HOCKER:RUSSELL HORTON
GREEN ACRES
NEWT KILEY : KAY KUTER
ROY TRENDELL :ROBERT FOULK
ALICE.
ANDY :PAT CRANSHAW
STUFF JOHNSON :ARTHUR SPACE
THAT IS SEVERAL CHARACTERS WHO
HAD CHUCK CUNNINGHAM SYNDROME.
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