Boys Will Be Boys - S4.E4

When the town decides it needs a Volunteer Fire Department, after a mishap nearly burns down the stable, the choice of chief is between Alec and Clive. It is Hetty who casts the deciding vote, for Clive! The fire department is unruly and disorganized, until Felix's science experiment goes awry, almost burning down the school and they all work together as a team to save it.