one of the amazing parts of Plex is how it managed the library with episode / movie details and cast info as well as posters and backgrounds.
Here is an example with the Classic Doctor Who.
So on Roku you can view the info like that, or for my uses with the PS3 it will give a thumbnail of the poster (or just a thumbnail of the episode with TV) so you can get a better idea. And there are mobile apps for it to view on the go as well. (the server software is free) mobile apps cost $5
* I have all 26 classic Doctor Seasons on there as well as all the released Modern Doctor Who stuff the DVDs get to sit on the shelf and look pretty