A „friendly“ date between Tommy and the widow of his dead cousin takes a unexpected turn when she makes a move on Tommy. Franco’s ex-girlfriend shows up at the firehouse and claims he’s the father of her five-year-old daughter, turning his life upside down.
Tom is furious upon finding out that Lyttel took his son Kyle into custody. Diana offers him help in getting Kyle back. Meanwhile, Richard suspects that Collier is trying to take control of Lily’s life, and as soon as Collier reveals his intentions, Richard and Lily leave Arcadia Estates. Elsewhere, Danny snaps at Shawn when he finds out that he and Nikki have slept together. Tom and Diana finally find out what really happened to the 4400, which leaves a disturbing question: is this the end – or just the beginning?
George is induced to accompany her Happy Time co-workers on their annual woodland retreat. However, even there she can’t escape from her duties as a reaper. Mason loses his post-it note with the name of the next soul to reap. Joy does her best to sell her house, much to Reggie’s dislike, who scares them away saying that George, her late sister still keeps in touch with her from beyond the grave.
After a series of run-ins with the Wraith, the team begins to suspect their Athosian allies of having a spy in their midst.
Daniel is stranded on another planet after the team’s arrival on an alien world sparks a violent civil war.
Tommy decides to make life a living hell for his wife’s new boyfriend by wreaking havoc on his business and finances. Meanwhile, Chief Reilly faces possible suspension as the result of an altercation with a fellow firefighter and Lou decides to share his poetry.
The 4400 are attacked by a series of fire-bombings after Barbara Yates made their names and addresses known to the public. Tom, Diana, and Ryland try to put an end to the bombings at the same time as Tom tries to deal with the disturbing behavior of Kyle, and Diana tries real hard to be a good substitute mother to Maia. However, the arrival of a Homeland Security agent from Washington, Warren Lyttel, makes their work even harder. Jordan Collier tries to provide his followers with safe shelter, but Richard and Lily begin to question his intentions as the bombings intensify.
George is bummed when she finds out that her parents are selling the home she grew up in, her bike’s been stolen and at work she is suspected of stealing office supplies. Daisy goes on her assignment to the jewelry shop, while Mason is trying to prove to everyone that he is not drinking anymore.
The team finds themselves in mortal danger when their Puddle Jumper ship becomes lodged in the Stargate.
General O’Neill tries to settle into his new job, but faces never-ending crises – including the capture of SG-1 by the Goa’uld.