The Only Child in the World - S2.E11

Kathy and Meck steal the trans dimensional boat to go try to find Sun and to stop Ashka -- but the machine gets broken and they get sent to yet another parallel world -- this is a world where their are no Children -- even though Kathy is only 13 - she is considered a child and it starts a riot amongst the adults who have wanted a child - but because of a disease 100s of years before no child can be born. This is a major problem for Kathy.