The episode begins with a scene at Springfield Elementary School, where the students are gathered for a school assembly. Principal Skinner announces that the school will be adopting a new student, a girl named Millie, who is an orphan. Millie is introduced as a sweet and cheerful child, and the students are encouraged to welcome her. However, her arrival is met with mixed reactions, as some students are excited while others are indifferent.

As Millie starts to integrate into the school, she quickly becomes friends with Lisa Simpson. Lisa is drawn to Millie's optimistic personality and her ability to see the good in everyone. They bond over their shared interests, and Lisa feels a sense of responsibility to help Millie adjust to her new environment. Meanwhile, Bart Simpson is skeptical of Millie and her seemingly perfect demeanor, leading him to play pranks on her.

In a pivotal scene, Millie reveals to Lisa that she has been living in a series of foster homes and has never really had a stable family. This revelation deepens Lisa's empathy for Millie, and she decides to help her find a permanent home. Lisa's determination to help Millie leads her to brainstorm ways to make Millie more appealing to potential adoptive parents.

As the story progresses, Lisa organizes a talent show at the school, hoping to showcase Millie's talents and attract the attention of families looking to adopt. Millie participates in the talent show, performing a heartfelt song that resonates with the audience. However, despite her performance, no families step forward to adopt her, leaving Millie feeling disheartened.

In a subplot, Bart's pranks escalate, and he eventually pulls a prank that backfires, causing Millie to be upset with him. Bart feels guilty for hurting Millie's feelings and begins to reflect on his actions. He realizes that he has been unfair to her and decides to make amends. Bart approaches Millie and apologizes, offering to help her with her talent show performance.

As the talent show approaches, Lisa and Bart work together to support Millie. They help her practice and build her confidence. The night of the talent show arrives, and the auditorium is filled with parents and families looking to adopt. Millie performs again, and this time, her performance is even more powerful, capturing the hearts of the audience.

After the show, a couple expresses interest in adopting Millie. They approach her and share their desire to provide her with a loving home. Millie is overjoyed at the prospect of finally having a family, and she thanks Lisa and Bart for their support. However, as the couple prepares to take Millie home, she hesitates, feeling a mix of excitement and fear about leaving her friends behind.

In the final moments of the episode, Millie makes the decision to go with the couple, expressing her gratitude to Lisa and Bart. The episode concludes with a bittersweet farewell as Millie leaves Springfield Elementary, leaving a lasting impact on her friends and the community. Lisa reflects on the importance of friendship and the challenges of finding a family, while Bart learns a valuable lesson about kindness and empathy.

In the ending of "Little Orphan Millie," Millie is adopted by the Simpson family after a series of events that highlight her desire for a family. However, the adoption does not go as planned, leading to a humorous yet poignant conclusion where Millie ultimately decides to leave the Simpson household to find her own path.

As the episode progresses towards its conclusion, we see Millie, the orphan girl, becoming increasingly integrated into the Simpson family. Initially, she is excited about the prospect of being adopted, and the Simpsons, particularly Marge, are enthusiastic about the idea of bringing her into their home. However, as time goes on, Millie's quirks and behaviors begin to clash with the Simpson family's dynamics.

In a pivotal scene, Millie's eccentricities become more pronounced, leading to a series of comedic misunderstandings. Homer, who initially finds her endearing, starts to feel overwhelmed by her presence. He struggles with the idea of sharing his attention and affection, which he usually reserves for his own children. Marge, on the other hand, tries to maintain a supportive environment, but she also feels the strain of having another child in the house.

As the climax approaches, Millie realizes that she is not fitting in as she had hoped. In a heartfelt moment, she expresses her feelings of being out of place, which resonates with the Simpsons, who have their own insecurities and family dynamics to navigate. This leads to a touching conversation where they all acknowledge their differences and the challenges of family life.

Ultimately, Millie makes the decision to leave the Simpson household. In a bittersweet farewell, she thanks the family for their kindness but feels that she needs to find her own way. The Simpsons, particularly Marge, are left with a sense of loss but also a deeper understanding of what it means to be a family, even if it's not always perfect.

In the final scenes, we see Millie walking away, determined yet hopeful, while the Simpsons reflect on their time with her. The episode closes with a sense of resolution, highlighting the importance of family, acceptance, and the journey of self-discovery. Each character, especially Millie, is left with a sense of growth and the understanding that family can take many forms, even if it doesn't always look like what one expects.

In the episode "Little Orphan Millie" from season 19 of The Simpsons, there is indeed a post-credit scene. After the main story concludes, the scene features a humorous moment involving the character Millie, who is the orphan girl that Bart befriends. In this brief scene, Millie is seen in a whimsical setting, where she is happily playing with a group of children. The scene captures her joyful spirit and innocence, contrasting with the more serious themes of the episode regarding family and belonging. The lightheartedness of the moment serves as a comedic relief, leaving viewers with a smile as the credits roll.

Millie, an orphaned girl, is motivated by her desire for a family and a sense of belonging. She feels a connection to the Simpsons after being inspired by their warmth and camaraderie, which she longs for in her own life.

Bart is initially annoyed and dismissive of Millie when she arrives at the Simpson household. He feels threatened by her presence, as she seems to overshadow him with her cheerful demeanor and eagerness to fit in.

Lisa takes on a nurturing role, trying to help Millie adjust to her new surroundings. She empathizes with Millie's situation and encourages her to embrace her individuality, which leads to a deeper bond between the two girls.

Homer is initially oblivious to Millie's attempts to bond with the family, often distracted by his own interests. However, he eventually warms up to her, recognizing her need for acceptance and support.

Millie faces several challenges, including Bart's jealousy and the difficulty of adapting to the chaotic lifestyle of the Simpson family. She struggles with feeling like an outsider and the pressure to prove herself as a valuable member of the family.

In "Little Orphan Millie," there are a few scenes and themes that may be considered objectionable or upsetting for children or sensitive viewers:

1. Death and Orphanhood: The episode revolves around the theme of orphanhood, which may be distressing for younger viewers as it touches on the loss of parents and the emotional struggles of being an orphan.

2. Emotional Manipulation: There are moments where characters experience deep sadness and emotional turmoil, particularly related to Millie's situation, which could be heavy for sensitive audiences.

3. Social Issues: The episode addresses themes of neglect and the challenges faced by children in difficult circumstances, which may be uncomfortable for some viewers.

4. Dark Humor: The show often employs dark humor, which might not resonate well with all audiences, especially in the context of serious topics like abandonment and family dynamics.

These elements may require parental guidance for younger viewers to help contextualize the themes presented in the episode.