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Plot Summary

A (Ad Infinitum) (2021) Plot Summary Explained

Release, runtime and language
2021 · 153 mins · Telugu
Echo score 75
Directed by
Ugandhar Muni
Starring
Preethi Asrani, Rangadham, Nithin Prasanna, Krishnaveni, Baby Deevana

Sanjeev struggles with amnesia, unable to recall his past, and is haunted by recurring dreams that offer glimpses into a forgotten life. As he investigates these fragmented memories, he uncovers a surprising and complex reality that surpasses his initial expectations.

On this page (6)
  1. 1 Where to watch
  2. 2 What happens: full plot
  3. 3 Plot questions answered
  4. 4 Movie threads
  5. 5 Movies like A (Ad Infinitum)
  6. 6 Every angle

Where to watch

Where to Watch A (Ad Infinitum) (2021)

Where can you watch A (Ad Infinitum)? Stream, rent or buy it in the US, including on Amazon Video: current JustWatch availability with up-to-date prices.

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Full plot summary · contains spoilers

What Happens in A (Ad Infinitum): Full Plot Summary

The whole story of A (Ad Infinitum) (2021) explained, from the opening scene to the final frame: every key event, every twist and what it all adds up to. Read it as a quick recap before the sequel, to check a scene you missed, or to finally understand what really happened.

Sanjeev is a disabled hospital receptionist who is married to a nurse Pallavi and father to a daughter Amrutha. After being found injured in a forest about 59 km from Hyderabad, he is admitted to the same hospital and begins to piece together a life that feels strangely familiar, all while grappling with memory gaps that refuse to fade. He clings to a quiet hope of normalcy, yet his nights are haunted by a recurring dream: a dark, silent room where an unknown figure conducts brain surgery on a shaved patient, and the image lingers long after waking.

In parallel, Officer Vishnu of the Preventive Crimes Unit is assigned to a troubling wave of missing children—mostly orphans and runaways. The only solid lead is a CCTV clip showing a hooded man and a dog snatching a child from the highway in the pre-dawn hours. A local newspaper reporter who witnessed the incident helps Vishnu draft a sketch of the suspect, narrowing the field but leaving the case open to possibilities that stretch beyond a simple abduction.

Driven by a thirst to understand who he really is, Sanjeev leans on his friend Yasir, who uncovers a striking clue: a photograph in a book about India’s Emergency era depicting a lookalike of Sanjeev from more than three decades ago. The trail leads them to Ashwatthama, a student leader once linked to a bombing of a police station and never located. A further chat with an old acquaintance of Ashwatthama reveals that the last person known to have seen him was his former girlfriend Amrutha. Yet when Sanjeev presses on with the search, Pallavi chides him for risking their family’s safety by chasing a past that she fears could disrupt Ammu’s world.

The investigation takes a dark turn when the police sketch appears to match Sanjeev himself, and Vishnu arrests him on the spot. Pallavi and Yasir, however, reveal a crucial truth: CCTV footage from the hospital at the time of Ammu’s kidnap shows Sanjeev’s alibi, clearing him of involvement. Before relief can settle in, a new threat emerges—a man who looks exactly like Sanjeev abducts Ammu from her school, forcing Vishnu to redouble his pursuit and casting doubt on the family’s safety once more.

Sanjeev consults with the now-older Amrutha, who shares a startling memory: the last time she saw Ashwatthama was decades ago, when he told her he was headed to his brother’s house. This clue points Sanjeev toward a remote forest house, where he confronts the source of his dreams—the dark room filled with several tonsured patients on whom brain surgery had been performed. Through the recovered memories, he discovers a brutal truth: he is Ashwatthama, who fled to conceal a terrible secret within his family. Ashwatthama’s brother Arjun—a physician obsessed with the pituitary gland and the possibility of halting aging—had perfected a form of immortality on himself and his sibling but failed to replicate it in others.

Armed with this revelation, Sanjeev learns Ammu, being the offspring of the immortal Sanjeev, holds the key to amplifying the process. The pursuit escalates when Vishnu closes in, but Arjun intervenes and kills Vishnu, aiming to seize Ammu for his own experiments. A furious confrontation ensues; Sanjeev fights Arjun, defeats him, and sets fire to the house, burning Arjun’s research and rescuing the other kidnapped children in the process. The blaze marks a brutal end to a dangerous quest and marks the city’s return to safety, at least for now.

In the aftermath, Inspector Yuvraj, who had aided Vishnu, informs Sanjeev that the property once belonging to Arjun is now a clue in the case, and asks if Sanjeev knows who the man behind the mystery is. Sanjeev chooses to guard the truth, claiming no recollection of the past, but Yuvraj recognizes echoes of a family name in his records that align with Arjun’s history. A final press conference is held to address the events, while a scarred and burning Arjun watches from the shadows—carrying a file on Ammu and a determination to complete his research at any cost, leaving open the possibility that the pursuit of immortality may not be over.

Last updated: February 10, 2026 at 08:32

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Plot questions answered

A (Ad Infinitum) Plot Explained: Your Questions Answered

The questions people ask most about A (Ad Infinitum) (2021): what happens in the confusing scenes, why the characters do what they do, the twists, hidden details and what the ending means. Each answer contains spoilers.

Q1

Why is Sanjeev found injured in the forest with amnesia?

Sanjeev is found injured in a forest 59 km from Hyderabad because he is actually Ashwatthama, a fugitive who fled after bombing a police station decades ago. He went into hiding at his brother Arjun's remote forest house, where he underwent immortality experiments. The memory loss and injuries resulted from this hidden past and the experimental procedures performed on him.

Foreshadowing: His recurring dream of a dark room performing brain surgery hints at the medical procedures that altered his memory and body.

  • amnesia
  • forest
  • ashwatthama
  • sanjeev
  • injury
Q2

Who is Ashwatthama and how is he connected to Sanjeev?

Ashwatthama is a student leader from over 30 years ago who was wanted for bombing a police station and never located. Sanjeev discovers he IS Ashwatthama, he changed his identity and underwent immortality experiments with his brother Arjun. The photo discovered by Yasir showing a lookalike was actually Sanjeev himself from decades earlier.

Foreshadowing: The photograph in the Emergency-era book foreshadows Sanjeev's true historical identity.

  • ashwatthama
  • identity
  • sanjeev
  • fugitive
  • bombing
Q3

Why are children being kidnapped in the movie?

Children are being kidnapped by Arjun (Sanjeev's brother) to serve as subjects for his brain surgery experiments aimed at perfecting his immortality formula. He targets orphans and runaways because their absence is less likely to be noticed. The tonsured patients in the dark room are these kidnapped children who underwent the experimental procedures.

Foreshadowing: The CCTV footage of a hooded man with a dog matches the abductions that ultimately connect to Arjun's laboratory.

  • kidnapping
  • children
  • arjun
  • experiments
  • brain surgery
Q4

Why does Arjun target Ammu specifically?

Arjun targets Ammu because she is Sanjeev's daughter, and Sanjeev is one of the two successful immortals created through Arjun's experiments. Ammu carries the genetic key to amplifying the immortality process, making her essential for Arjun to replicate the effect on others and perfect his research.

Foreshadowing: Arjun's revelation that Ammu holds the key to duplicating immortality ties directly to the earlier discovery that Sanjeev himself is immortal.

  • ammu
  • arjun
  • immortality
  • genetics
  • daughter
Q5

What is Arjun's immortality research about?

Arjun is a physician obsessed with the pituitary gland and the possibility of halting aging. He successfully perfected immortality on himself and his brother Sanjeev, but failed to replicate the effect on others. His research involves performing brain surgery on subjects to alter their pituitary function, resulting in the dark room full of tonsured patients.

Foreshadowing: The recurring dream of brain surgery foreshadows Arjun's experimental procedures.

  • arjun
  • immortality
  • pituitary
  • brain surgery
  • experiments
Q6

Who is the man who looks exactly like Sanjeev?

The man who looks exactly like Sanjeev and abducts Ammu is not explicitly identified in the film, but he appears to be either a subject of Arjun's experiments or a deliberately placed decoy. His existence reinforces the theme of duplicate identities and may have been used by Arjun to create confusion and draw Sanjeev into his trap.

Foreshadowing: The presence of a Sanjeev double foreshadows the larger mysteries surrounding identity and experimentation.

  • double
  • clone
  • abduction
  • ammu
  • kidnapper
Q7

What happens to Officer Vishnu in the end?

Officer Vishnu is killed by Arjun when he tracks Sanjeev to the forest house. Arjun murders Vishnu to prevent him from interfering with his plan to capture Ammu for his experiments. Vishnu's death occurs during the confrontation at the forest hideout before Sanjeev defeats Arjun.

Foreshadowing: Vishnu's pursuit of Sanjeev throughout the film builds toward this tragic confrontation.

  • vishnu
  • death
  • killed
  • arjun
  • police
Q8

Why does Sanjeev lie about his identity at the end?

Sanjeev lies about having no recollection of his past to protect his family and preserve his new life with Pallavi and Ammu. Revealing that he is Ashwatthama, a former terrorist, and an immortal would endanger them and destroy the normalcy he has built. Inspector Yuvraj suspects the connection to Arjun's family but cannot prove it.

Foreshadowing: Throughout the film, Sanjeev's pursuit of his past conflicts with Pallavi's warnings about endangering their family.

  • identity
  • lie
  • ashwatthama
  • yuvraj
  • secret
Q9

Does Arjun survive and what does the ending imply?

Arjun survives the fire and watches the press conference from the shadows, scarred but determined. He carries a file on Ammu and vows to continue his research, implying that the pursuit of immortality is not over and he will return to claim her for his experiments.

Foreshadowing: The fire at the house represents a climactic defeat but not a final one, as Arjun's obsession with immortality exceeds his concern for his own survival.

  • arjun
  • survive
  • ending
  • threat
  • immortality
Q10

What is the meaning of Sanjeev's recurring dream?

Sanjeev's recurring dream of a dark room where brain surgery is performed on a tonsured patient is a repressed memory of his own experience at Arjun's laboratory. The dream contains fragments of the experiments that gave him immortality, surfacing as his memories gradually return.

Foreshadowing: The dream serves as the primary foreshadowing device, eventually leading Sanjeev to discover the truth about his past.

  • dream
  • brain surgery
  • memory
  • repressed
  • tonsured

Movie threads

More Movies Like A (Ad Infinitum), by Mood & Story

Curated lists built around what makes A (Ad Infinitum) tick: the same mood, the same kind of story or the same emotional payoff. Each list explains why these movies belong together.

Mind-bending memory maze thrillers like A (Ad Infinitum)

Protagonists must untangle fractured memories to uncover a disturbing truth. Discover movies similar to A (Ad Infinitum), where a protagonist's amnesia leads to a high-stakes investigation into a forgotten past. This thread features tense science fiction and thriller films that explore themes of identity crisis and fragmented memory.

  • suspenseful
  • paranoid
  • unsettling
  • mysterious
  • atmospheric
  • anxious
  • Tone: tense, mysterious, unsettling
  • Pacing: steady, investigative
Why these movies?

The story pattern: Stories typically follow a protagonist who awakens with no memory or a fractured sense of self. As they investigate their past, they encounter resistance and discover clues suggesting a hidden, often sinister, reality. The plot unfolds through a series of reveals that challenge the protagonist's understanding of who they are, building to a climax where they must confront the shocking truth.

Why they belong together: Movies in this thread share a specific narrative structure built around amnesia and investigation. They create a pervasive mood of paranoia and suspense, driven by the protagonist's desperate search for identity against a backdrop of hidden dangers and complex conspiracies.

Identity crisis sci-fi thrillers with high stakes like A (Ad Infinitum)

A race against time to reclaim one's identity from unethical experimentation. If you liked the blend of personal identity crisis and high-stakes science fiction in A (Ad Infinitum), you'll enjoy these similar movies. This thread groups films where characters confront unethical experiments while battling to save themselves and their loved ones.

  • tense
  • melancholic
  • thought-provoking
  • mysterious
  • suspenseful
  • dark
  • Tone: atmospheric, morally complex, tense
  • Pacing: steady, dual plotline
Why these movies?

The story pattern: The narrative typically follows two interconnected paths: a deeply personal struggle with identity and memory loss, and a larger external conflict involving a shadowy organization or unethical scientific pursuit. These plots converge, forcing the protagonist to use their personal journey as the key to overcoming the external threat, often resulting in a bittersweet victory where fundamental questions remain unanswered.

Why they belong together: This thread connects films that share a specific blend of high-concept science fiction with the intimate, emotional weight of an identity crisis. The tone is consistently tense and atmospheric, with a focus on the moral and psychological implications of scientific power.

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Every angle

A (Ad Infinitum) (2021) Explained: Plot, Timeline & Characters

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