Cast to someone who wishes to be uncredited. This role is listed for reference.

Applejack has a supporting role again this arc, especially as one of the big sisters revealing her mev status to a younger sister. That revelation has some tension between her and Apple Bloom, that eventually settles down.

Chapter Appearances with dialogue:
Chapter 12 - Revelations Begin
Chapter 13 - Discord Willing
Chapter 14 - Revelations Continue
Chapter 15 - Marked Filly Curiosity
Chapter 18 - Appealing Danger
Chapter 20 - Meeting Into Project Mercury

Context and italicized audition lines:

0 - [Context: After being updated on the possibility of telling all of the CMC and asked by Rainbow Dash and Rarity her thoughts on the matter, Applejack is suggesting when Rainbow Dash should tell Scootaloo about her master mev status.]

"Yeah, I hear ya. I'm thinking you should tell Scootaloo tomorrow," Applejack said. "She's got one of her Rainbow Dash fan club meetings then."

1 - [Context: Applejack is confessing her fledgling status to Apple Bloom who is getting worked up over it, making Applejack feel very defensive.]

"Let me finish Apple Bloom," Applejack insisted. "Yes. Yes, I am, but it's different, alright? I'm barely a vampire in comparison. I do it to help Rainbow. Once a week, she and I can exchange magic and it helps keep her under control. She's the master, and I'm one of her fledglings."

2 - [Context: Applejack is just letting Apple Bloom and Sweetie Belle what Fluttershy is up to and why she is not at the Washouts show with all of them.]

"As for Fluttershy," Applejack changed the subject, "she'd rather stay home on care-taking duty today. She can leave her patient. He's not so bad off, but I guess it's just enough that's where she wants to be now that she doesn't have to worry about work at the school."