The episode begins with Dexter Morgan grappling with the aftermath of the previous season's events, particularly the revelation of his dark secret to his sister, Deborah Morgan. He is haunted by the implications of his actions and the potential fallout. Dexter is seen in his apartment, where he meticulously cleans his tools, reflecting his need for control amidst the chaos in his life. He is also trying to maintain a facade of normalcy, especially in his interactions with his son, Harrison.

Deborah is dealing with her own emotional turmoil. She is now the Lieutenant of the Miami Metro Police Department and is struggling to balance her professional responsibilities with her personal feelings about Dexter. She is particularly affected by the knowledge that Dexter is a serial killer, which complicates her ability to trust him. In a meeting with her team, she expresses her determination to catch the "Doomsday Killer," a case that has been consuming her focus.

Meanwhile, a new character, Sal Price, a journalist, is introduced. He is writing a book about the Doomsday Killer case and is eager to get inside information from the police. He approaches Deborah, who is initially dismissive of his advances but later finds herself intrigued by his insights. Sal's presence adds tension, as he is not only interested in the case but also in Deborah personally.

As the investigation into the Doomsday Killer continues, Dexter decides to take matters into his own hands. He begins to track down the killer, who is revealed to be a man named Travis Marshall. Dexter's internal monologue reveals his determination to stop Travis before he can kill again, driven by his own code of ethics. He feels a sense of urgency, knowing that the police are struggling to make progress.

Dexter's investigation leads him to a church where Travis is attending a service. Dexter observes him from a distance, noting his interactions with a woman named Gellar, who is later revealed to be a significant figure in Travis's life. Dexter's instincts tell him that Travis is not just a killer but is also being manipulated by Gellar, who represents a darker influence.

In a parallel storyline, Deborah is dealing with the pressure of her new role. She faces skepticism from her colleagues, particularly from Captain LaGuerta, who is still suspicious of Dexter. Deborah's frustration grows as she tries to assert her authority while also managing her complicated feelings about her brother. She confides in her partner, Quinn, about her struggles, revealing her internal conflict regarding Dexter's actions.

As Dexter continues to gather information on Travis, he discovers that the killer is planning another murder. Dexter's urgency escalates, and he prepares to confront Travis. He sets a trap, using his skills to lure Travis into a vulnerable position. The tension builds as Dexter meticulously plans the encounter, showcasing his methodical nature and the thrill he derives from the hunt.

The climax of the episode occurs when Dexter finally confronts Travis. The scene is charged with suspense as Dexter reveals himself, and a physical struggle ensues. Dexter's training and experience come into play as he fights Travis, who is initially caught off guard. The confrontation is intense, with both men grappling for control. Dexter ultimately gains the upper hand, but instead of killing Travis immediately, he decides to extract information about Gellar, believing that understanding the full scope of the threat is crucial.

In the aftermath of the confrontation, Dexter learns that Gellar is not just a mentor to Travis but is also a figment of his imagination, a manifestation of his fractured psyche. This revelation shocks Dexter, as it complicates his understanding of the case and the nature of evil he is dealing with. Dexter's internal conflict deepens as he realizes that Travis is not just a monster but a victim of his own delusions.

The episode concludes with Dexter returning home, where he reflects on the day's events. He is left with a sense of unease, knowing that the battle against the Doomsday Killer is far from over. Deborah, meanwhile, is shown in her office, contemplating her next move in the investigation, her expression a mix of determination and uncertainty. The final moments highlight the growing tension between the siblings, setting the stage for the conflicts to come as they navigate their complex relationship amidst the chaos of their lives.

At the end of "Sunshine and Frosty Swirl," Dexter Morgan finds himself in a precarious situation as he grapples with the consequences of his actions. The episode concludes with Dexter confronting the reality of his dark urges while navigating the complexities of his relationships, particularly with his sister, Debra, and the new threat posed by the return of Hannah McKay.

As the episode unfolds, Dexter is still reeling from the aftermath of the previous events, particularly the revelation of his dark secret to Debra. The tension between them is palpable, and Debra is struggling to reconcile her feelings about Dexter's vigilante justice with her role as a police officer.

In a pivotal scene, Dexter attends a meeting with the Miami Metro Police Department, where he is introduced to the case of a new serial killer, the "Doomsday Killer." This killer has been leaving behind a series of gruesome crime scenes that pique Dexter's interest. He begins to investigate the case, using his unique skills to piece together the clues.

Meanwhile, Debra is dealing with her own turmoil. She is haunted by the knowledge of Dexter's true nature and is trying to maintain her professional demeanor while grappling with her personal feelings. In a moment of vulnerability, she confronts Dexter about his actions, leading to a heated exchange that reveals the depth of their complicated relationship.

As the investigation into the Doomsday Killer progresses, Dexter discovers that the killer has a connection to Hannah McKay, a woman from his past who has her own dark history. Dexter's interest in Hannah is rekindled, and he finds himself drawn to her despite the potential danger she represents.

In a climactic moment, Dexter tracks down the Doomsday Killer, leading to a tense confrontation. The killer is ultimately apprehended, but not without leaving a trail of destruction in his wake. Dexter's methods come into question, and he is forced to confront the moral implications of his actions once again.

The episode concludes with Dexter standing at a crossroads. He is left to ponder the consequences of his choices, both as a vigilante and as a brother. Debra, still grappling with her feelings, is left in a state of uncertainty about her relationship with Dexter. The final scenes hint at the growing tension between Dexter's dark urges and his desire for a normal life, setting the stage for the conflicts to come.

In summary, the fates of the main characters are intertwined in a web of secrets and revelations. Dexter continues to walk the line between his dual identities, while Debra is left questioning her loyalty and the nature of justice. The episode closes with a sense of foreboding, as the characters are drawn deeper into a world of darkness and moral ambiguity.

In "Sunshine and Frosty Swirl," the second episode of Dexter's seventh season, 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 events without extending into a post-credit moment.

Hannah McKay is introduced in this episode as a key character who has a connection to a series of murders. Dexter becomes intrigued by her, and she plays a significant role in the unfolding events.

In this episode, Dexter struggles with the aftermath of Debra discovering his dark secret. Their relationship becomes strained as Debra grapples with her feelings of betrayal and confusion about Dexter's true nature.

Dexter attempts to maintain his normal life while hiding his dark urges and the truth about his actions from Debra. He is also trying to manage the tension that arises from Debra's knowledge of his secret.

The investigation into the Doomsday Killer continues as the Miami Metro police work to uncover the identity of the killer. Dexter uses his own methods to gather information while trying to stay one step ahead.

The title 'Sunshine and Frosty Swirl' refers to a specific ice cream shop that becomes a focal point in the episode, symbolizing the contrast between Dexter's seemingly normal life and the dark reality of his actions.

In "Sunshine and Frosty Swirl," the second episode of Dexter's seventh season, there are several scenes and themes that may be considered objectionable or upsetting for children or sensitive viewers.

1. Violence: The show features graphic depictions of violence, including scenes of murder and bloodshed, which may be disturbing.

2. Murder Investigation: The episode involves a murder investigation, showcasing crime scene elements that can be unsettling.

3. Dark Themes: The overarching themes of the show revolve around serial killing, morality, and the psychological struggles of the main character, which may not be suitable for younger audiences.

4. Emotional Distress: Characters experience significant emotional turmoil, including grief and betrayal, which could be upsetting for sensitive viewers.

5. Adult Language: The dialogue includes strong language and adult themes that may not be appropriate for children.

These elements contribute to the show's mature rating and may not be suitable for a family-friendly viewing experience.