Beyond the Time Barrier (1960) Timeline Explained – Every Event in Order

Allison is viewed as humanity's last hope for repopulation because the Citadel's population is nearly completely sterile. The cosmic plague devastated fertility rates, leaving only a handful of survivors capable of reproducing. Since Allison is the first fertile male to arrive in decades, the Supreme sees him as a literal 'Adam' to restart humanity with his granddaughter Trirene, making them the de-facto parents of a new civilization.

Foreshadowing: The Supreme mentions early on that fertility among citizens is almost non-existent, setting up the desperate urgency around Allison.

• adam
• repopulation
• sterility
• trirene
• citadel population

The cosmic plague caused by lethal cosmic rays damaged the majority of the Citadel's population, rendering them deaf-mutes. Only the Supreme and his Captain retained their hearing and speech. This creates a stark division in the society where the few who can speak hold all the political power, while the majority communicate through sign language and Trirene's telepathic abilities.

Foreshadowing: When Allison first arrives, he notices the eerie silence and the unsettling way people communicate, establishing the strange social hierarchy.

• deaf-mute
• cosmic plague
• hearing
• speech
• mutation

The cosmic plague was triggered by nuclear fallout in 1971 that damaged Earth's atmosphere. This allowed lethal cosmic rays to penetrate the surface, devastating humanity. Even those living underground in the Citadel were affected, though the 'scapes explain the full extent of the devastation took time to manifest as fertility rates plummeted and mutations spread.

Foreshadowing: The mutants in the containment area blame the Citadel residents for their suffering, hinting at the plague's origin.

• cosmic plague
• nuclear fallout
• 1971
• cosmic rays
• atmosphere damage

When Allison flew the X-80 into sub-orbital space in 1960, he crossed what the 'scapes describe as a 'time barrier.' This caused him to slip forward through time to the year 2024. The time-travel appears to be accidental and tied to the experimental nature of the aircraft, though the scientists explain that his presence already represents a time-slip with potential consequences for other eras.

Foreshadowing: The X-80 is described as experimental, and radio contact is lost during the flight, indicating something extraordinary happened.

• time travel
• x-80
• sub-orbital flight
• time barrier
• 1960 to 2024

The 'scapes are time travelers who arrived in the Citadel from different eras: Captain Markova came from 1973 (a Russian officer), while General Kruse and Professor Bourman arrived from 1994 after escaping from distant colonies. Each was pulled through the same time barrier that brought Allison. They exist outside the normal timeline and warn Allison that his presence could alter other eras unpredictably.

Foreshadowing: Trirene shows Allison photographs revealing the Citadel's layered history before introducing him to these travelers.

• scapes
• time travelers
• markova
• kruse
• bourman
• 1973
• 1994

Trirene is killed by a stray bullet during the gunfight between Kruse and Bourman as they struggle over Kruse's pistol. While Allison manages to overpower Bourman, the bullet has already struck Trirene, ending her life before he can save her. Her death represents the loss of the Citadel's best hope for repopulation and devastates both Allison and the Supreme.

Foreshadowing: The gunfight erupts suddenly as the time travelers turn on each other, with bullets flying in the confined space.

• trirene death
• stray bullet
• gunfight
• kruse
• bourman
• death scene

Despite viewing Allison as essential to his people's survival, the Supreme allows him to leave because Trirene's death has broken his resolve and convinced him that hope must exist elsewhere. He directs Allison to a secret passage out of the Citadel, and secretly places Trirene's ring on his finger as a final gift, hoping Allison might somehow find a way to prevent the catastrophe that destroyed his world.

Foreshadowing: The Supreme is devastated by Trirene's death and tells Allison that he must choose hope over desperation.

• supreme
• secret passage
• trirene ring
• escape
• hope
• citadel ruler

Allison returns to 1960 aged dramatically and warns officials about the nuclear fallout in 1971 that will destroy Earth's atmosphere and trigger the cosmic plague. He pleads for them to heed these warning bells and take action to prevent the catastrophe. His debriefing includes the grave implications for humanity's future if the timeline isn't altered.

Foreshadowing: The 'scapes warn throughout that Allison's presence could alter eras, setting up the urgency of his warning.

• warning
• debriefing
• nuclear fallout
• 1971
• future warning
• officials

Nuclear fallout from 1971 severely damaged Earth's atmosphere, allowing lethal cosmic rays to penetrate the planet's surface. This catastrophic event triggered the cosmic plague that devastated humanity and left the surviving civilization hidden underground in the Citadel. The atmospheric destruction is the root cause of all the mutations, sterility, and societal collapse that Allison witnesses in 2024.

Foreshadowing: The 'scapes explain that the timeline damage began with the 1971 nuclear events.

• atmosphere damage
• nuclear fallout
• cosmic rays
• 1971
• plague cause

Trirene possesses telepathic abilities that allow her to read minds, which she uses to determine whether visitors are threats. She reads Allison's thoughts and senses he is not a spy, which earns him a more cautious but eventually welcoming reception from the Supreme. Her telepathic empathy is the primary way she communicates with others and forms the basis of her bond with Allison.

Foreshadowing: Trirene reads Allison's thoughts shortly after his arrival, confirming his truthful intentions.

• telepathy
• mind reading
• trirene
• communication
• thoughts

The bald, ferocious mutants are survivors of the cosmic plague who blame the Citadel's residents for their suffering. They believe the Citadel dwellers are responsible for the plague that afflicted them, and they vow vengeance against the underground city. The Captain sends Allison to face them so he can witness the threat firsthand and understand the full scope of the post-apocalyptic world.

Foreshadowing: The mutants attack during Allison's early exploration, revealing the external danger to the Citadel.

• mutants
• containment area
• plague survivors
• attack
• cosmic plague

The Supreme secretly places Trirene's ring on Allison's finger before he returns to his own time. This ring serves as a tangible symbol of the connection between Allison and Trirene, as well as a hopeful link to the Citadel's world. It represents the fragile thread of possibility that the Supreme believes might inspire Allison to find a way to prevent the catastrophe that destroyed his civilization.

Foreshadowing: The Supreme's final gesture of placing the ring suggests he has accepted that Allison may be their only hope for change.

• trirene ring
• token
• hopeful symbol
• connection
• return gift