Digimon

Season 6: Digimon Xros Wars (Digimon Fusion)

Episode 30: Brand New Journey!! Tokyo Showdown!!

Ending up back in their world, with Shoutmon invisible to all but them, Mikey, Angie and Jeremy learn that their time in the Digital World was about half a day in their reality with no one believing them. Mikey later hears the voice who had granted him the Fusion Loader, though is unable to find it.