The episode begins with Sheldon and Amy in their apartment, where they are discussing their future. Sheldon is feeling anxious about the upcoming decision regarding whether to accept a job offer at Caltech in Pasadena or to stay in their current situation. He expresses his concerns about the potential changes that could come with the move, particularly how it might affect their relationship and their friends.

Meanwhile, Leonard and Penny are in their own apartment, where they are also grappling with a significant decision. They are contemplating whether to have a baby. Leonard is excited about the idea, but Penny is hesitant and unsure if she is ready for such a big commitment. This conversation reveals Penny's fears about motherhood and the changes it would bring to their lives.

As the episode progresses, Sheldon and Amy visit their friends to discuss their respective decisions. They gather at the apartment of Howard and Bernadette, where the group engages in a lively discussion about the pros and cons of both moving and starting a family. Howard and Bernadette share their experiences with parenthood, which adds to Penny's anxiety about the idea of having children. The group dynamics highlight the differing perspectives on life changes, with Sheldon and Amy leaning towards the idea of moving, while Leonard and Penny are more focused on the baby discussion.

In a pivotal moment, Sheldon decides to take a step back and reflect on his feelings. He realizes that he needs to consider not just his own desires but also Amy's feelings about the potential move. He expresses his love for her and acknowledges that their relationship is the most important factor in his decision-making process. This moment of vulnerability showcases Sheldon's growth as a character, as he learns to prioritize his partner's needs alongside his own.

Simultaneously, Leonard and Penny have a heart-to-heart conversation about their future. Leonard reassures Penny that they can take their time with the decision about having a baby. He emphasizes that they should only pursue parenthood when they both feel ready. This conversation helps to alleviate some of Penny's fears, and she begins to warm up to the idea of starting a family.

As the episode nears its conclusion, Sheldon and Amy come to a mutual understanding about their future. They decide that they will not rush into any decisions regarding the job offer or moving. Instead, they agree to take their time and discuss their options further. This decision reflects their commitment to each other and their relationship.

The episode ends with a light-hearted moment as the group gathers for a game night. They engage in playful banter and laughter, showcasing the strong bond they share as friends. The atmosphere is filled with warmth and camaraderie, leaving the audience with a sense of hope for the future of both couples as they navigate their respective life choices together.

In the ending of "The Decision Reverberation," Amy and Sheldon face a significant decision regarding their future, while Leonard and Penny navigate their own relationship choices. Ultimately, Sheldon proposes to Amy, solidifying their commitment to each other, while Leonard and Penny decide to start a family, embracing the next chapter of their lives together.

As the episode unfolds, we find ourselves in the familiar setting of the apartment shared by Sheldon and Amy. The atmosphere is charged with anticipation as Amy reveals that she has received an offer for a prestigious position at Princeton University. This news sends Sheldon into a spiral of anxiety, as he grapples with the potential of Amy moving away. He is torn between supporting her career ambitions and the fear of losing her.

In a series of scenes, Sheldon's internal conflict becomes palpable. He expresses his concerns to Leonard, who encourages him to be supportive. However, Sheldon's insecurities surface, leading to a heated discussion between him and Amy. She feels frustrated by his reluctance to embrace change, while Sheldon struggles to articulate his feelings about their future together.

Meanwhile, Leonard and Penny are also at a crossroads. They discuss the possibility of starting a family, but Penny is hesitant, fearing the changes that come with parenthood. Leonard, eager to take the next step in their relationship, tries to reassure her, but the conversation reveals deeper insecurities about their readiness for such a commitment.

As the episode progresses, Sheldon realizes that his fear of losing Amy is rooted in his love for her. In a pivotal moment, he decides to confront his feelings head-on. He prepares a heartfelt proposal, expressing his desire to marry her and promising to support her dreams, no matter where they may lead. This moment is filled with emotional weight, showcasing Sheldon's growth and his understanding of the importance of partnership.

In a parallel scene, Leonard and Penny have a breakthrough in their conversation about starting a family. They share their hopes and fears, ultimately deciding that they are ready to take the plunge into parenthood together. This decision marks a significant evolution in their relationship, highlighting their commitment to each other.

The episode culminates in a touching scene where Sheldon proposes to Amy in a beautifully intimate setting. She is overwhelmed with joy and accepts, solidifying their bond. The moment is filled with warmth and love, showcasing the culmination of their journey together.

As the credits roll, we see Leonard and Penny embracing their decision to start a family, while Sheldon and Amy embark on their new chapter as an engaged couple. Each character has faced their fears and made choices that reflect their growth, setting the stage for their futures together. The episode ends on a hopeful note, emphasizing the importance of love, support, and the willingness to embrace change in relationships.

In "The Decision Reverberation," there is no post-credit scene. The episode concludes without any additional scenes after the credits roll. The focus remains on the main storyline and character developments throughout the episode, wrapping up the narrative without extending into a post-credit moment.

In this episode, Sheldon grapples with the decision of whether to accept a prestigious job offer from a university in another state, which would require him and Amy to move away from their friends and their current life in Pasadena.

Amy is supportive of Sheldon's career advancement but is also concerned about the implications of moving away from their friends and the life they have built together. She expresses her feelings about the potential impact on their relationship.

Leonard serves as a sounding board for Sheldon, providing advice and sharing his own experiences about making life-changing decisions. He encourages Sheldon to consider the emotional aspects of the move, not just the professional benefits.

Penny is initially taken aback by the news of Sheldon and Amy potentially moving away. She expresses her sadness at the thought of losing their close-knit group and the impact it would have on their friendships.

By the end of the episode, Sheldon decides to turn down the job offer, realizing that his relationships with his friends and Amy are more important to him than the opportunity, demonstrating his growth in valuing personal connections over career advancement.

"The Big Bang Theory" Season 12, Episode 20, titled "The Decision Reverberation," contains themes and situations that may not be suitable for all children or sensitive viewers. Here are some potentially objectionable or upsetting aspects:

1. Relationship Tension: The episode explores complex emotional dynamics between characters, including discussions about commitment and personal choices, which may be difficult for younger viewers to fully understand.

2. Conflict and Disagreement: There are scenes of disagreement and conflict among friends, which could be unsettling for children who may not be accustomed to seeing such interpersonal strife.

3. Mature Themes: The episode touches on themes of life decisions and the pressures of adulthood, which might resonate differently with younger audiences.

4. Humor Style: The humor often includes sarcasm and adult-oriented jokes that may not be appropriate for children.

5. Emotional Vulnerability: Characters express feelings of uncertainty and vulnerability, which could be upsetting for sensitive viewers.

Overall, while the show is a comedy, the emotional depth and relationship complexities may require a more mature audience to fully appreciate and process.