If Series 4 happens or if it had happened, and it's never impossible for the show to return, what should happen? We know Jazz James would have become a regular character but apart from that anything is possible.
What I think should happen:
A new species of aliens begin to threaten the Earth. They don't eat magic but are extremely powerful. They become the main enemy for Series 4 as Tom has to find a way to save the world. Maybe the Prospector could come back.
Tom, Michael and Ursula go to another planet. It would be so cool to see the Nekross homeworld of Nekron . Or another alien planet. I think leaving the Earth for some stories would be really cool.
New evil wizards. Even though it's Wizards vs Aliens it would be cool to see some more evil wizards, like Warlock.
Benny should come back. At least for the finale or something.
Tell me what you guys think should happen.