While the Mall Rats try to carry on after suffering two devastating losses, a strange cult dedicated to Zoot arrives on the shores near the City.

The Mall Rats arrive back home, despondent and still reeling from their loss. Lex, Tai-San and Ebony bring the antidote to the Mall, while Bray brings Danni.

The Mall Rats find themselves harassed by kids desperate for the antidote. Following her destruction of the formula, Tai-San searches for herbs to create her own version of it while the Chosen continue their journey to the City.

Just as the gang are preparing to flee the Mall, Tai-San claims that she has made the antidote. Trudy feels increasingly alone, while an enraged Alice and others arrive at the Mall demanding the real antidote.

Alice takes Tai-San hostage until she is sure that Ellie is on the mend, and when she is, the two sisters decide to move to the Mall, with Alice becoming Tai-San's bodyguard. Meanwhile, the Chosen arrive in the City.

Alice appoints Dal as Chief of the farm in her absence, while Bray and Danni begin arranging a meeting of tribe leaders. The Chosen arrive in the City and move in on the Mall Rats.

Bray, Danni and Ebony attend the meeting of tribe leaders, which goes well until the Chosen arrive and frighten away the other leaders. Meanwhile, Alice becomes concerned about Tai-San, who begins exhibiting symptoms of the Virus.

Alice is increasingly worried by Tai-San's continued illness, while Jack and Ellie search for answers about the Virus much to Danni's annoyance. Trudy appoints Patsy as Brady's official child minder, with disastrous results.

Trudy is distraught following Brady's kidnapping, with Patsy fleeing to escape her wrath. Tai-San is in a critical condition after an explosion in the laboratory and Alice is determined to find proof that KC was behind it.

Tai-San has woken from her coma, but is suffering from amnesia. Still distraught, Trudy is outraged by the warm welcome Patsy receives when she returns to the Mall, and the video Jack and Ellie discovered proves to be highly significant.

Bray finds it difficult to deal with Tai-San's decision to tell him the formula, Jack and Ellie investigate the theory that the Virus came space, while Danni creates a Bill of Rights just as the Chosen invade Alice's farm.

After being confronted by the Chosen at the farm, Dal arrives to tell the tribe about them and they deduce that the Chosen stole Brady. Salene's frustration at Ryan's aloofness sends her off the rails, while Jack makes a shocking discovery.

In order to get the Guardian on her side, Ebony tricks Trudy into following her to the Chosen's lair. Jack and Ellie try to find the missing videotape and theorize about the Virus, while Salene and Ryan continue to butt heads.

With Ebony's fate in Trudy's hands, the pair reminisce about their lives with Bray and Martin before the Virus.

The tribe discovers Trudy is missing and Tai-San suggests the Chosen as culprits. Jack and Ellie have trouble expressing their feelings for each other. Meanwhile, at the Chosen's lair, Trudy and Ebony hatch an escape plan.

Ebony makes Bray a proposition, while Trudy is forced to join the Chosen. Will she ever see her friends again?

Reeling from his loss, Bray lashes out at Lex, who he blames for Trudy's disappearance. KC, Patsy and Cloe go trading, Ellie tries to smooth things over with Jack, while Ebony resorts to blackmail to get what she wants.

Ebony is irritating everyone with her newfound authority, while Lex finds himself unneeded and unwanted. Jack and Ellie continue to blow hot and cold for each other and Ryan tells Salene about his life with Lex before the Virus.

The tribe is occupied with the tribal leader gathering which they are arranging at the Mall, and Danni is confident about her Bill of Rights. Jack is jealous of Dal and Ellie's newfound closeness, while Ebony hatches a deadly scheme.

A deflated tribe buries Bob, with Tai-San convinced someone tried to poison her and the finger pointed at an unlikely person. Jack and Ellie begin work on the news sheet, while Salene tries to help Lex.

Lex's actions have severe consequences for him, while Ebony's questions at Danni's trial lead to a startling revelation.

Danni's trial reaches its conclusion, prompting more questions than answers. Jack's jealousy about Ellie and Dal continues, Bray tries to make amends with Tai-San and Ebony's scheming intensifies.

The tribe host a trading market. Danni worries that Jack and Ellie will find information related to her father's work, while Patsy and Cloe get a new dog, and Lex meets his match.

Danni's secret is out, with Bray's authority called into question. Spotting an advantage, Ebony plots to take over the tribe, while Lex finds himself double crossed.

Ellie is frustrated by the tribe's refusal to print the truth about the Virus in the news sheet, while Danni is enjoying her new job as Judge, and Spike is back, looking for revenge.

Dal is frustrated with his work party, who believe that the Virus is gone. Ebony is Spike's prisoner, Jack and Ellie are in romantic bliss, while Ryan proves to be a successful teacher.

Tai-San has a dream about Ebony being imprisoned, but finds it difficult to convince the others that she is in danger. Ebony herself continues to have flashbacks about Zoot, and Patsy and Cloe decide to find boyfriends.

The tribe find that they are no longer trusted, with the other tribes turning against them. Ebony is an emotional wreck after her ordeal with Spike, and Dal finds himself the object of Patsy and Cloe's affections.

The Mall Rats are pleased to be trading and working with the other tribes again, Patsy and Cloe continue their pursuit of Dal, while Tai-San tries to help Ebony recover.

Ellie is determined to print everything the tribe knows about the Virus in the news sheet, Salene is frustrated by Ryan and his pressuring her to start a family, and Lex's incompetence costs the tribe dearly.