Stargate Atlantis/Season Four

Season Four
Stargate Atlantis
Season Premiere	September 28, 2007
Season Finale	March 7, 2008
Episode Count	20
Previous Season Three	Next Season Five

Season Four of Stargate Atlantis premiered on September 28, 2007

Episodes

#	#	Title	Written By	Directed By	Airdate
61	1	Adrift (2)	Martin Gero	Martin Wood	September 28, 2007
When Atlantis starts shutting down due to a damaged power system, Rodney McKay turns off all non-essential systems. But in just 28 hours, McKay realizes the city's shields may fail completely and its inhabitants will succumb the vacuum of space.
62	2	Lifeline (3)	Carl Binder	Martin Wood	October 5, 2007
Lt. Col. Sheppard leads a daring raid to secure a ZPM that will save Atlantis. When the Replicators become aware of the incursion into their city, Sheppard's team must keep them at bay or else abandon the mission and their hope of saving Atlantis.
63	3	Reunion	Joseph Mallozzi & Paul Mullie	William Waring	October 12, 2007
Ronon reconnects with a group of Satedans from his past who enlist the Atlantis team's help on a dangerous mission against the Wraith. But after the Atlantis crew is captured, Ronon is faced with the truth about his old friends' new loyalties.
64	4	Doppelganger	Robert C. Cooper	Robert C. Cooper	October 19, 2007
During an exploratory walk on a jungle planet, Sheppard touches a glowing crystalline growth and becomes host to an infectious energy form. Once on Atlantis, the entity begins to move from person to person, putting the entire crew at risk.
65	5	Travelers	Joseph Mallozzi & Paul Mullie	William Waring	October 26, 2007
On his way back to Atlantis, Lt. Col. Sheppard is taken prisoner by a rogue ship helmed by a ruthless human commander with a secret agenda. As the team searches for him, Sheppard's resourcefulness is put to the test as he tries to stay alive.
66	6	Tabula Rasa	Alan McCullough	Martin Wood	November 2, 2007
With Atlantis plagued by an amnesia-causing virus, McKay wakes up with no idea who he is or what is going on. Following instructions from a video he recorded earlier, McKay frees himself and sets out to find the key to unlocking this mystery.
67	7	Missing	Carl Binder	Andy Mikita	November 9, 2007
Arriving on New Athos for an overnight visit, Teyla and Dr. Keller discover the entire settlement abandoned and their own lives in jeopardy from the Bola Kai, a fierce warrior tribe. The pair must avoid capture until Atlantis sends a search party.
68	8	The Seer	Alan McCullough	Andy Mikita	November 16, 2007
With still no trace of the Athosians, Teyla requests an off-world visit to meet with a seer, Davos, who may be able to help her find her people. Meanwhile on Atlantis, Agent Woolsey arrives to observe and review Col. Carter.
69	9	Miller's Crossing	Martin Gero	Andy Mikita	November 30, 2007
After working for countless hours on the Replicator coding, Dr. McKay reluctantly admits that he needs help from his sister, Jeanie. But she goes missing, McKay travels to Earth determined to find her and uncover who is behind the kidnapping.
70	10	This Mortal Coil (1)	Brad Wright and Joseph Mallozzi & Paul Mullie	William Waring	December 7, 2007
As Dr. McKay struggles to figure out why the stargate has been inoperable, a mysterious probe plunges into the city. A sweep of the probe offers McKay a shocking glimpse of nanite code before his diagnostic program crashes and all the data is lost. Teleplay by Joseph Mallozzi & Paul Mullie
71	11	Be All My Sins Remember'd (2)	Martin Gero	Andy Mikita	January 4, 2008
Armed with the means to track Replicator ships, the Atlantis team strives to eliminate the Replicators once and for all. Now, the team rushes to evacuate those human settlements in the path of the advancing Replicator forces.
72	12	Spoils of War (3)	Alan McCullough	William Waring	January 11, 2008
The Atlantis long-range sensors detect the signal of a subspace tracking device familiar to Dr. McKay. The team follows to signal to a damaged hive ship drifting in space. Amidst the ship's records, they discover references to a secret Wraith base.
73	13	Quarantine	Carl Binder	Martin Wood	January 18, 2008
When an alarm sounds, McKay suspects that a highly infectious disease has triggered the city's self-protection system. With vital systems affected, the Atlantis team finds themselves trapped in various sections of the city with no way out.
74	14	Harmony	Martin Gero	William Waring	January 25, 2008
Wanting to maintain diplomatic relations, Sheppard and McKay accompany Harmony, a precocious young princess, on a mandatory rite of passage. However, they are unaware that she has enemies, and character flaws, yet to be dealt with.
75	15	Outcast	Alan McCullough	Andy Mikita	February 1, 2008
When Lt. Colonel John Sheppard receives word that his father has passed away he returns to Earth. But once there, he becomes embroiled in a dangerous experiment gone awry -- a human form Replicator now on the loose that must be recaptured at all cost.
76	16	Trio	Martin Gero	Martin Wood	February 8, 2008
During an off-world mission in a village rocked by fierce tremors, Col. Samantha Carter, Dr. McKay, and Dr. Keller become trapped when they fall into a sinkhole. But every attempt to escape the confines of the chamber puts them in further jeopardy.
77	17	Midway	Carl Binder	Andy Mikita	February 15, 2008
The IOA has entrusted Mr. Coolidge, with interviewing Teyla Emmagan and Ronan Dex about their suitability to continue with the Atlantis expedition. Unbeknownst to anyone, a plan by the Wraith to invade the Midway station is about to be initiated.
78	18	The Kindred (1)	Joseph Mallozzi & Paul Mullie	Peter F. Woeste	February 22, 2008
Teyla, more determined than ever to find the missing Athosians, convinces Sheppard to travel with her to a trading settlement in search for answers. What they find there leads them to a startling discovery that no one could have anticipated.
79	19	The Kindred (2)	Alan McCullough	Martin Wood	February 29, 2008
After an unforeseen return, Dr. Carson Beckett shares that he has been held captive. As Teyla is re-united with some missing fellow Athosians, she begins to formulate a plan to ensure their escape, if she is able to find them in time.
80	20	The Last Man (1)	Joseph Mallozzi & Paul Mullie	Martin Wood	March 7, 2008
Disheartened by another unsuccessful search for Teyla, Lt. Colonel Sheppard returns to Atlantis and senses that something is not right -- the city has been abandoned. Now, McKay sets out on a risky plan to reverse a future that went horribly wrong.