Depending on how you are using the title in a sentence, the "proper article" changes based on standard English grammar: 1. Using it as a Title
The episode title refers to the tenth episode of the seventh season of The Clone Wars . [S7E10] Master Plan
If you are writing an essay or a blog post, the most natural way to phrase it is: "In the episode 'Master Plan'..." Depending on how you are using the title
" The '[S7E10] Master Plan' episode is a fan favorite." 2. Referring to the "Plan" within the story Referring to the "Plan" within the story If
If you are talking about the actual scheme or plot inside the episode's narrative:
Use this if you are introducing the concept for the first time. ("Darth Sidious set a master plan into motion.") 3. In a List or Citation
If you are listing episodes, you generally do need an article. Example: "Next on the watchlist: [S7E10] Master Plan."