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Season guide

Stargate Atlantis: Season 4

20 episodes Premiered Sep 27, 2007 Updated Oct 4, 2026

Role: Meticulous television and film archivist. Task: Produce a JSON object for "Stargate Atlantis" Season 4. Constraints: Use ONLY provided SYNOPSIS and SOURCES. No invented titles, names, dates, counts, awards, ratings, box-office, viewership, or plot points. If a detail is missing, omit it. Output: Valid JSON only (no markdown). Keys: overview (160-220 word summary), primer (array of exactly 4 concise bullet point

Previously on Stargate Atlantis

Season 4 Lore Primer

Key plot threads, lore context, and character stakes you need to remember before diving into this season.

  • ⚡ With changes in leadership and new allies, the team continues to battle the Wraith and confront new existential threats.
  • ⚡ Character alliances, factions, and personal loyalties undergo significant shifts under escalating stakes.
  • ⚡ Addresses unresolved cliffhangers and thematic mysteries introduced during previous seasons.
  • ⚡ Establishes the primary seasonal conflict that drives serialized character arcs toward the finale.
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Season overview

Role: Meticulous television and film archivist.
Task: Produce a JSON object for "Stargate Atlantis" Season 4.
Constraints:
Use ONLY provided SYNOPSIS and SOURCES.
No invented titles, names, dates, counts, awards, ratings, box-office, viewership, or plot points.
If a detail is missing, omit it.
Output: Valid JSON only (no markdown).
Keys: overview (160-220 word summary), primer (array of exactly 4 concise bullet points).
Style: Original, neutral, encyclopedic prose in plain text.
TMDB Season Synopsis: "With changes in leadership and new allies, the team continues to battle the Wraith and confront new existential threats. Personal dynamics shift as members struggle with loss and make significant choices that shape the fate of Atlantis and its mission in the Pegasus Galaxy."
Source [1]: "A new gate will open. A lost city will rise again. Overview With the Ancients' city of Atla..."
Source [3]: "With the Ancients' city of Atlantis discovered in the Pegasus Galaxy by Stargate Command, Dr. Elizabeth Weir and Major Sheppard lead a scientific expedition to the ancient abandoned city. Once there, the team not only find themselves unable to contact Earth, but their explorations unexpectedly reawaken the Ancients' de..."
Source [5]: Mentions "Lost City" (SG-1 finale) and "New Order" (SG-1 season 8 premiere). Mentions the Ancients' outpost in Antarctica.
Overview:
Goal: 160-220 words.
Content: Season 4 involves changes in leadership and new allies. The team battles the Wraith and faces new existential threats. Personal dynamics shift as members deal with loss and make significant choices regarding the mission in the Pegasus Galaxy and the fate of Atlantis.
Problem: The provided synopsis for Season 4 is very short (approx 45 words). To reach 160-220 words without inventing facts, I must look at the other sources. However, the other sources describe the general premise of the series, not specifically Season 4.
Constraint Check: "Use ONLY the synopsis and sources below".
Conflict: The Season 4 synopsis provided is too short to meet the 160-220 word requirement without inventing information.
Strategy: I will expand on the context provided in the sources (the discovery of Atlantis, the role of Dr. Elizabeth Weir and Major Sheppard, the inability

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Season 4 Episodes

Episode Guide

🛡️ SPOILER SHIELD

Season 4 Progress Shield

Future titles & synopses blurred. Tap "Reveal" on any card to peek.
Binge Efficiency Engine

Season 4: Filler vs. Essential Canon

Filter episodes by narrative weight. Focus on essential mytharc and skip standalone side quests.

15%
85%
Mytharc (3): Crucial lore & season climaxes
Core (17): Character development & subplots
Side Quest (0): Standalone / filler
S4·E1 Mytharc

Adrift (2)

Sep 27, 2007 · 44 min

Floating in deep space with the city's protective shield failing, the team must do all they can to keep Atlantis alive. A radical injury threatens Dr. Weir's life.

S4·E2 Core

Lifeline (3)

Oct 4, 2007 · 43 min

Colonel Sheppard and his team embark on a risky mission to steal a Z.P.M. power module from the Replicators -- but must rely on a compromised Dr. Weir to succeed.

S4·E3 Core

Reunion

Oct 11, 2007 · 44 min

When a group of Ronon's people enlist the team's help in raiding a Wraith weapons facility, Ronon reconsiders whether his future lies in Atlantis or with his friends.

S4·E4 Core

Doppelganger

Oct 18, 2007 · 43 min

During an off-world mission Colonel Sheppard unknowingly becomes host to an alien entity, which infects others in Atlantis and afflicts them with terrifying nightmares.

S4·E5 Core

Travelers

Oct 25, 2007 · 43 min

Colonel Sheppard is captured by the inhabitants of a generational ship and their beautiful leader, who wish to use his ability to use Ancient technology for their own ends.

S4·E6 Core

Tabula Rasa

Nov 1, 2007 · 44 min

When a virus causes amnesia in everyone except Teyla and Ronon, the Atlantis team must work together to find a cure before their memories fade entirely.

S4·E7 Core

Missing

Nov 8, 2007 · 44 min

During a visit to New Athos, Teyla and Dr. Keller find themselves on the run from a primitive tribe of warriors.

S4·E8 Core

The Seer

Nov 15, 2007 · 44 min

The team meets a man with extraordinary prophetic abilities, who gives them a dark prediction about Atlantis's future. The Wraith seek a new alliance with Atlantis in their war wit

S4·E9 Core

Miller's Crossing

Nov 29, 2007 · 44 min

Rodney McKay goes in search of his sister on Earth after she is kidnapped by the head of a powerful corporation.

S4·E10 Core

This Mortal Coil (1)

Dec 6, 2007 · 44 min

A mysterious drone crashes into Atlantis, indicating that the Replicators may have found the city. But when Elizabeth Weir appears, the team realizes that the probe is just a part

S4·E11 Core

Be All My Sins Remember'd (2)

Jan 3, 2008 · 44 min

With a plan to potentially extinguish the Replicator threat, the Atlantis team must seek an alliance with a fleet of Wraith ships.

S4·E12 Core

Spoils of War

Jan 10, 2008 · 44 min

The team finds their former Wraith ally's hive ship drifting in space, which leads them to a secret project that could turn the tide of a civil war.

S4·E13 Core

Quarantine

Jan 17, 2008 · 44 min

An automated lockdown traps Atlantis personnel in various parts of the city, each of them hoping the others will come to their rescue.

S4·E14 Core

Harmony

Jan 24, 2008 · 44 min

Colonel Sheppard and Dr. McKay must protect a child princess on a pilgrimage before she can become queen, and learn that she has dangerous enemies threatening her life.

S4·E15 Core

Outcast

Jan 31, 2008 · 43 min

While on personal leave on Earth, Sheppard and Ronon learn that scientists have engineered a human-form Replicator -- who is now on the loose.

S4·E16 Core

Trio

Feb 7, 2008 · 44 min

McKay, Carter, and Keller are trapped in an underground chamber while on an off-world mission, with no apparent means of escape.

S4·E17 Core

Midway

Feb 14, 2008 · 44 min

Teal'c visits Atlantis to counsel a headstrong Ronon, who is up for review by the I.O.A. But the two must work together when the Wraith invade the Midway space station in order to

S4·E18 Core

The Kindred (1)

Feb 21, 2008 · 44 min

As a mysterious new illness sweeps through the Pegasus Galaxy, Teyla is convinced by a vision that the father of her child is trying to communicate with her.

S4·E19 Mytharc

The Kindred (2)

Feb 28, 2008 · 44 min

The team is shocked when an old friend, believed to be dead, miraculously returns to them. Teyla plans an escape from Michael's captivity.

S4·E20 Mytharc

The Last Man (1)

Mar 6, 2008 · 44 min

Sheppard returns to Atlantis after a mission and finds the city abandoned, all systems dead -- and instead of ocean, sand dunes as far as the eye can see.

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