It's a Wrap

 a limited-time questline released on October 31, 2018. It the main questline of Act 3 of the Treehouse of Horror XXIX Event.

End
No dialogue.

End
No dialogue.

End
No dialogue.

End
"The invasion has been thwarted. But you can still send the Monster Masters on their jobs to Create Minions!"

- System Message.

"You have completed the Act 3 story! Keep Springfielders digging and cleansing Monster Minions to earn bonus donuts"

- System Message.