Last episode?
How was this conluded in the last episode of the last series?
Kill the spare
You can see the final episode on Youtube.
[Phil and Keely are voted "Cutest Couple," which resulted in them officially becoming a couple. Back at home, Pim finds out that Lloyd intentionally kept them in the past, and the time engine is repairs. Phil's happiness is ruined by the fact that they're all going back to the future. Keely is too sad to say goodbye, but Phil rushed back to Keely anyway. In the end, Phil and Keely kiss before Phil goes back. Once they're in the time stream, the Diffy's realize that they left Curtis behind, so they go back.
End.]
I like to think that either the time engine was permanently destroyed or the Diffy's decided not to go back. This way, Phil could stay with Keely.
Thank you
Kill the spare