This is attrakttv
, for now at least (naming things is hard).
It's a complete overhaul of trakt.jemu.name , and while not feature complete yet, it's at least a lot faster and less terrible.
You can look up TV show data from trakt.tv and get data and plots for seasons and episodes.
The source is available on GitHub
Select a show from the dropdown menu, or look up a new one by, well, entering a new thing.