Well that's a weird one!
MC gets it's TV episode information from TheTVDB.com. Specifically for this Show and Season:
http://thetvdb.com/?tab=season&seriesid=72521&seasonid=4361&lid=7As you said, it's listed as "Special". The only way I've found to get MC to grab this information is to use Season 0. Season 0 is "specials" as far as I can tell. If you then go to the Specials season in The West Wing, you'll see that this is episode one. So, set Season 0, Episode 1, then do Get Movie and TV info, and it pulls up the right info.
The rest of your episodes should be identified, but notice that it starts at episode number 1! So you'll want to renumber your episodes. Also note that another episode there is considered a special also.
You might find the Fill Track # from list order tool useful here. Or the Counter() expression. Either one can be used to bulk re-number your episodes.
Good luck!
Brian.