The Steamworks is extremely busy and Victor has to go pick up a new boiler for Spencer, so he leaves Kevin in charge. Thomas and Percy were about to leave after being cleaned when Thomas collides with a flatbed of oil drums. The flatbed rolls along the rails and hits Percy. Together, the friends play one of their favourite games, "Biff, Bash, Bosh", which involves shunting a truck back and forth. Kevin asks if he can play, but when he biffs into the side of the flatbed, he knocks it over, sending the oil drums all over the floor. Kevin is sad that he does not have buffers like a steam engine, but Thomas and Percy offer to return after work so that they can play "Bish, Bash, Bosh" again. Kevin decides that he must practice shunting like a steam engine.