[Spoiler] The receptionist at the 4400 office gives herself a shot of promycin, and it is brodcast all over the internet, along with information about how people can obtain promycin for themselves. Only problem is that her body doesn’t tolerate the shot well, and she dies just as Ryland’s people find the place that she, Jordan, the scientist and Shawn have been hiding out. Everyone but Shawn escapes, and he gets taken to NTAC for interrogation. It also turns out that Ryland knew that anyone taking promycin had a 50/50 shot of dying, but didn’t let that info out, so that Jordan would be discredited as a savior, when people started to die.
Tom asks Alana to use her powers to find out what Shawn knows about the whereabouts of the promycin, but before she can, Ryland sends in Isabelle to interrogate him. Isabelle can’t get Shawn to talk so she uses her powers to put him in a coma. Ryland and his men think they’ve found Jordan and the promycin, so the soldiers and Isabelle go inside of the building to get it while Ryland waits outside. It turns out to be a trap though, and the person that they believed was Jordan was actually a shape-shifting 4400. The promycin is fake and rigged with a bomb, that blows up, killing all the soldiers. Since Isabelle cannot die, she isn’t harmed, and decides to draw Jordan out by going to the 4400 center and killing people. After this, the real Jordan is shown paying people to give away promycin.
The scientist and his girlfriend are holding Richard hostage (he no longer wants to be a part of the promycin distribution plan) when they get the call about Isabelle killing people at the center, so they go there. Isabelle ends up in the classroom with Maya, and the other children, and chooses one of them to kill. Maya tells her that her plan isn’t going to work out, and just as she does this Tom and his partner (forgot her name) come in. Tom tries to inject Isabelle with the syringe he got from the lady in the future, but Isabelle overpowers him. She’s just about to kill him when Richard comes in, and begs her to stop. She won’t listen so Richard uses his power to pick up the syringe and inject her. Instead of killing her, it strips her of her powers. Richard begs Tom not to hurt her, but he shoots her anyway.
At the end, Tom’s partner and her bf decide to take Maya away for six months to try to live a normal life. Alana tells Maya that they’ll see each other again, but Maya says “we’ll be back but you won’t be here.” Later, Alana is shown being warped away by something in the sky (she’s alone, so no one sees this). Maya’s aunt is shown getting promycin from a distributer. Shawn and Isabelle are shown lying unconscious in hospital beds. [/Spoiler]
I think that’s everything.
This season hasn’t been as good as the others, but I still want to see where the story is going to go. I agree with the person that said this season was very jumpy, and that lots of things weren’t properly fleshed out, some of the shows really didn’t have a point (like the magical herbs episode). The first season was definitely the best.