This may look like the final episode of the series. In the end of this episode the Gatekeeper returns at the center and smiles about something. I'm not sure about this but maybe the Gatekeeper will create another Gateway that will set evil to roam earth once again. And after that MOM will realize that evil is back and open the center again in a new location and Martin, Diana and Java will be back in business. And maybe Martin Mystery will have a new title like Totally Spies: Undercover. And Martin will have a new U-Watch and new gadgets like Totally Spies having new gadgets.