Doctor Who seems to have been off air for ages, so fans will be delighted to see this spin-off, starring Katherine Kelly as Quill, a grumpy physics teacher.

Her class of exceptional students find their lessons interrupted by shadowy monsters, who come through splits in time and space in search of a mysterious alien.

Among the students is Charlie, who claims to be from Sheffield despite his posh southern accent, and April, a girl who just wants a date for the prom.

Peter Capaldi makes a welcome cameo as the Time Lord and Katherine is wonderful as the acerbic Quill. Be warned, Class is surprisingly violent at times.