The storylines in BBC Three’s Class will apparently contain some “mature themes,” viewers have been warned.

Set in contemporary London at Coal Hill Academy, the eight-part YA sci-fi series will premiere on BBC Three online and air on BBC One in October.

Peter Capaldi is rumoured to be guest starring in the first episode of the new Doctor Who spin-off, which “centres on four students as they face their own fears and navigate a life of friends, parents, school work, sex, sorrow – and possibly the end of existence.”

The BBC has now advised parents that Class “will feature more mature themes than Doctor Who,” asking them to “note it is not suitable viewing for younger audiences.”

Class creator Patrick Ness has since clarified: “Class is a YA show. Suitable for all the same audiences that read YA on up. End of story.”

The show’s cast is led Greg Austin, Fady Elsayed, Sophie Hopkins and Vivian Oparah as four Sixth Formers, with Katherine Kelly (Coronation Street) playing the role of teacher Miss Quill.

Class will be shown in the US on BBC America later this year.

The new season of Doctor Who is currently filming in Cardiff and is set to begin on BBC One in April 2017.