TV writer Russell T Davies - who brought Doctor Who back to the BBC - is to return to sci-fi with a new children's series.
His new CBBC series will see teenage sorcerers and intergalactic invaders do battle in action drama Aliens Vs Wizards.
Late last year Russell announced he was stepping back from his writing commitments to care for his partner who was being treated for brain cancer.
He withdrew from his work on a new drama being made in Los Angeles called Cucumber to return to the UK with Andrew Smith while he underwent treatment.
The new series will see two 16-year old schoolboys battling to keep alien invaders the Nekross at bay.
Russell began his career writing for children with series such as Dark Season and Children's Ward and also oversaw the launch of Doctor Who spin-off The Sarah Jane Adventures.
He said: "The show's a wild, funny, thrilling and sometimes scary collision of magic and science fiction.
"Writing for children is the biggest challenge of all and I think CBBC stands right at the heart of broadcasting."
The 12-part series is due to be screened in the autumn.