The guy is playing out this narrative in which a Duplo mobile prison built for a Beasty Support (a wooden rail support animated by a magic/sci-fi spray, per Dog Man) has been hijacked by Diesel 10 (a more or less evil engine from Thomas the Tank Engine). He and the Beasty Support have trapped Percy and some other engine in it and have driven it to the kitchen. I feel this is at par with prestige TV writing.