Scott Mitchell has blown up! 

The ex-Miami Dolphins quarterback who filled in so well for an injured Dan Marino back in 1993 that some fans were calling for him to be the full-time starter instead of the now Hall-of-Famer, will compete on television's "The Biggest Loser". 

Mitchell has ballooned to 366 pounds.  That's nearly 130 pounds heavier than he was during his playing time. 

Click Here to see a picture of Scott Mitchell these days.

Two other former pro athletes will also compete in the NBC weight-loss reality show, including 388 pound former offensive lineman for the New England Patriots Damien Woody and Zina Garrison from women's tennis.  She weighs in at 263 pounds.


Photo: Getty Images