What actors and actresses appeared in The Viewers - 2013?

It seems you are referring to the 2013 British horror film "The Woman in Black", not "The Viewers".

The main actors in the film were:

* Daniel Radcliffe as Arthur Kipps

* Ciarán Hinds as Mr. Daily

* Janet McTeer as Mrs. Daily

* Jessica Raine as Jennet Humfrye

* Liz White as Mrs. Alice Drablow

* Roger Allam as the Vicar

* Harry Melling as Young Arthur

* Sophie Ward as Young Jennet

* Timothy West as Mr. Jerome

If you were looking for information about a different movie, please provide more details so I can assist you better.