Humans: Trailer, certificate and where to watch

Synthetic humanoids rebel in a gripping sci-fi drama

Year: 2015-2018

Certificate: 15

Watch now on Channel 4

Watch now on Prime Video

This show, a big hit for Channel 4 when it launched in 2015, didn't look particularly sci-fi, despite its central characters being 'synths' - perfectly formed synthetic lifeforms with jewel-green eyes. The result was a series that explored what it means to be human that didn't just appeal to sci-fi fans. 

It's set in a parallel present, a world where synths are the latest must-have gadgets and servile home helps and carers. But a small number of them are capable of consciousness - they have thoughts and feelings that are forbidden of their kind - and it is this group, and their allies, that we follow as they fight for a new future for their kind. 

Colin Morgan started on the road to ditching his tweeny Merlin fanbase, playing the son of the synth's inventor who is part synth himself, one of a gang of conscious synths that includes Gemma Chan's gentle Anita/Mia and Emily Berrington's feisty Niska. (Three series)