If there is ever a threequel, Sir Topham Hatt will turn out to have been behind the event that caused Bertha to go crazy.
In a potential 3rd film. Doctor Hans will return.
Seeing as he's the only one involved with Biofusion to have not appeared in G-1 and given that Kieth has been disposed of... He may finally come back to end his and his father's biggest mistake and potentially factor into Sodorland's separation. The reason there are so many continuity problems between Shed 17 and Project G-1 is because it is a film within a show.
The denizens of Sodor are all alive and well and were hired to act in both films. The third film will be a making-of featurette where all of the engines and their friends are interviewed about their experiences while filming, where we will learn that bio-fusion is indeed fiction within the context of the film, but at least one engine did have to go to rehab for a Welsh coal addiction after the others were forced to stage an intervention. Edward in particular will complain about the other characters as would an angry old man.- It will also be revealed that instead of bio-fusion, vehicles with faces have a First Firing.
