Orignally the character Derek (who first appeared in the series' fifth season) was supposed to be brought back in this episode, however due the script incorrectly calling him "Paxman" (the name of the class of engine Derak is based on and his name early on in development) the animators thought him to be the character Paxton and put him in the scene instead of Derak. Had he returned this would have been his first appearance in the series and first speaking role in the franchise since his debut episode, his first appearance in the franchise since his cameo in "Calling All Engines" and his first appearance in the cgi era of the series.