EW has learned exclusively that Downton Abbey alum Dan Stevens will lend his voice to the Greg Berlanti-produced Tomorrow People, voicing biological computer TIM, a character first established in the ’70s British version of the show and originally voiced by Canadian actor Philip Gilbert.

Stevens, who will next be seen alongside Benedict Cumberbatch in The Fifth Estate, is far from the first actor to be heard-but-not-seen on a TV series. Kristen Bell was the voice of Gossip Girl for six seasons, Bob Saget has been the voice of Future Ted on How I Met Your Mother for going on nine seasons, and Ron Howard acted as the uncredited narrator of Arrested Development during the show’s run.