Babylon 5: Thirdspace (1998) Timeline Explained – Every Event in Order

Thirdspace is a parallel universe that exists beyond both normal space and hyperspace. It is inhabited by an extremely ancient, violent, and powerful alien species that possesses strong telepathic abilities. The Vorlons built a Jumpgate a million years ago in an attempt to contact what they called 'the gods,' but the gate actually connected to Thirdspace, unleashing this hostile civilization.

Foreshadowing: Lyta's 'race memory' reveals this hidden dimension early in her briefing with Sheridan and Delenn.

• thirdspace
• parallel universe
• vorlons
• aliens
• telepathy

The artifact was a gateway to Thirdspace, and the aliens inhabiting that dimension are telepathic. Their invasion strategy involved using the artifact to mentally influence and eventually control station personnel. This created thralls who would disrupt Babylon 5's defenses from within, making the station vulnerable to the incoming Thirdspace fleet.

Foreshadowing: The artifact's influence begins with dreams before manifesting as full waking control, showing the telepathic link strengthening over time.

• artifact
• mind control
• thralls
• telepathy
• invasion

Dr. Trent and a colleague decided to power up the device to accelerate their examination of the artifact, believing they could learn more about its function faster. They deliberately kept this from Captain Sheridan, creating a security breach that directly led to the catastrophic reactivation of the Thirdspace gate.

Foreshadowing: The timeline shows Trent's decision occurs during the initial examination phase, before the full dangers are understood.

• dr. trent
• activation
• captain Sheridan
• artifact
• authorization

The Vorlons built the artifact a million years ago, originally believing it would allow them to contact their gods. Instead, it connected to Thirdspace, and the violent aliens there used telepathy to convert a small army of Vorlons into thralls. The non-thrall Vorlons shut down the gate during the resulting stalemate, but the thrall Vorlons sent the artifact into hyperspace to preserve it for future reactivation.

Foreshadowing: Lyta's race memory explains this ancient history, revealing the Vorlons' direct involvement in creating and later containing the artifact.

• vorlons
• artifact
• ancient history
• thralls
• gate

Lyta Alexander has the ability to access 'race memory' - a form of inherited telepathic knowledge from past generations. Through this ability, she received information directly from the Vorlons about the gate's construction and the specific telepathic code needed to deactivate it. This made her the crucial link in stopping the invasion.

Foreshadowing: Sheridan and Delenn specifically seek out Lyta because they know her telepathic abilities might provide answers no one else can access.

• lyta alexander
• race memory
• deactivation
• telepathy
• vorlons

The thralls were under the telepathic control of the Thirdspace aliens, whose species is inherently violent and bent on exterminating all other life. The controlled individuals first demanded faster excavation of the artifact, then became increasingly aggressive. This violence was intentional - part of the invasion strategy to weaken Babylon 5's internal defenses before the Thirdspace fleet arrived.

Foreshadowing: Deuce, the thrall leader, escalates from demands to violence as the artifact's influence grows stronger.

• thralls
• deuce
• violence
• mind control
• invasion strategy

Sheridan used a thermonuclear device to destroy the artifact itself at the critical moment when the first wave of Thirdspace heavy warships was emerging from the portal. Destroying the gate cut off the connection to Thirdspace, immediately ending the telepathic influence and halting the alien invasion.

Foreshadowing: Lyta's deactivation instructions were meant as the primary solution, but Sheridan chooses the nuclear option as the invasion reaches its peak.

• captain Sheridan
• thermonuclear
• destroy artifact
• invasion
• gate

After the crisis is resolved, Lyta privately carries the knowledge that the artifact was merely one of many mistakes the Vorlons have made throughout their ancient history. This burden of forbidden knowledge - combined with understanding the true nature of the threat from Thirdspace - leaves her visibly troubled, even though the immediate danger has passed.

Foreshadowing: The final scene deliberately shows Lyta's private moment of brooding, indicating this knowledge weighs heavily on her.

• lyta alexander
• vorlons
• mistakes
• knowledge
• brooding

The Vorlons built the gate a million years ago believing it would allow them to make contact with what they considered to be gods. However, the gate actually connected to Thirdspace - a parallel universe inhabited by an ancient, violent, telepathic species. The Vorlons' original intent was religious contact, but they accidentally opened a doorway to an exterminating alien civilization.

Foreshadowing: Lyta explicitly states the Vorlons built the gate 'with a purpose that cannot be expressed in human terms except as an attempt to make contact with the gods.'

• gate
• vorlons
• gods
• intent
• religious contact

Sheridan and the surviving crew choose to hide the truth about the artifact from those who ask questions, assuring themselves that such an incident is unlikely to occur again. This cover-up appears designed to prevent panic and maintain stability on the station, though it leaves important questions unanswered for the general population.

Foreshadowing: The cover-up is mentioned in the final timeline events, showing this decision is made after the immediate crisis ends.

• cover-up
• sheridan
• truth
• incident
• reoccurrence

The Thirdspace fleet was vastly more advanced than anything Babylon 5 possessed. Their single-occupant fighters were equipped with deflector shield technology, making them extremely difficult to destroy. They were able to obliterate large cruisers with minimal effort, and only the destruction of the artifact itself stopped the invasion.

Foreshadowing: The battle description emphasizes the overwhelming technological advantage of the Thirdspace forces during the invasion sequence.

• thirdspace fleet
• fighters
• deflector shields
• technology
• advanced

Dr. Trent is deeply shaken by the way the artifact affected her and the other station personnel. Despite being a representative from Interplanetary Expeditions, she chooses to turn over her final report and remove herself from field work. The experience clearly impacted her psychologically, suggesting she felt responsible for the consequences of her unauthorized actions.

Foreshadowing: Trent's decision to activate the device without authorization directly led to the crisis, making her guilt understandable.

• dr. trent
• hiatus
• guilt
• responsibility
• interplanetary expeditions