Nickelodeon Guts (stylized as Nickelodeon GUTS) is an American television action sports competition series hosted by American actor/writer Mike O'Malley and officiated by English actress Moira "Mo" Quirk. The series originally ran from 1992 to 1995 on Nickelodeon. Each episode features three young athletes competing against each other in four extreme versions of athletic events culminating in a fifth and final round which set the three competitors on a race up an artificial mountain to decide the victor.