Viewers of the Saturday morning program will be able to vote for their choice to appear in a special performance of Chitty Chitty Bang Bang at the Dominion.
In order to enter, children will have to impersonate television presenters Claire Richards, Brian Dowling, Ian 'H' Watkins or Tess Daly.
This four-week competition, which marks a new relationship between television and the West End, begins on Saturday, July 20.
The four finalists involved will be given acting classes before a final round sees the one victor elected on Aug. 24.
—By Paul Webb