Dual Trouble is an American sitcom which aired in 1984 to 1985. The show celebrities identical twins Jean and Liz Sagal as Allison and Kate Fostertwo adolescents residing under the watchful eye of the father. The show had been considered a upgrading of the"twins in mischief" theory seen in films such as The Parent Trap and also the Patty Duke Show of this 1960s.