Max, with the help of Kal Langley, undertakes a dangerous journey as he seeks to learn of the fate of Tess and his son. Meanwhile, back in Roswell, Isabel and Jesse must face the negative reactions of their parents and friends to their impending marriage.

When an old love visits Maria her passion for music resurfaces, which jeopardizes her relationship with Michael. Meanwhile, while Max's father is still trying to put together all the pieces of his investigation, Isabel joins Max in the quest to stop him.

Duplicate versions of Michael, Isabel and Tess come to Roswell after killing their king Zan, to urge Max to attend an important interstellar summit in New York City, but they have their own agenda; Ava stays behind in Roswell.

Michael works as a security guard, but when he tries to loosen up his co-workers, he causes more harm than good. Meanwhile, Max and Liz continue to see each other despite her parents' wishes.

With Alex's ghost as her guide, Isabel must finally confront her fears about love and her conflicted feelings for Jesse. Meanwhile, Maria happily discovers a whole new, human part of Michael in, of all places, a bowling alley, and Liz and Max struggle to remain together despite her father's insistent disapproval.

Max travels to Hollywood while investigating a murder he believes was committed by an alien. He discovers a link to a Paramount science fiction show called "They Are Among Us" and when he goes to the Paramount lot to investigate he ends up auditioning for the part of an alien on an episode of "Enterprise" directed by Star Trek alum, Jonathan Frakes. Meanwhile, back in Roswell, Isabel and Jesse struggle over how to reveal their engagement to their families.

Right before her wedding, Isabel is torn with doubt when she has erotic dreams of her former alien lover, Kivar. Meanwhile, a reluctant Max agrees to serve as Jesse's best man, while attempting to investigate him at the bachelor party.

After their idyllic wedding, Isabel and Jesse are stalked on their honeymoon by her alien lover Kivar who plots to take her back to their home planet. Learning of this, Max and Michael arrive intent on destroying the alien. Meanwhile, Liz and Maria discover that Philip has begun a secret investigation of Max, including the diappearance of Tess, and he's embroiling Liz's dad into the whole thing.

Max and Tess depart for the interstellar summit in New York City with Rath and Lonnie, Michael and Isabel's duplicates, who both harbor a secret agenda for their future king and an alliance with Nicholas, the Skin. Ava reveals to Liz that Rath & Lonnie murdered Zan. Tess is kidnapped by the dupes after Max learns of their true intentions. When Max finally finds Tess she reveals that they tried to read her mind to find the Granolith but she resisted. She then says that they're gone but did they die or are they still out there? Ava says goodbye to Liz and leaves Roswell.

Sheriff Valenti is suspended from the force after refusing to answer the FBI's questions about Max and Isabel, but he soon finds himself right back in the thick of things when Laurie DuPree shows up at his house claiming to be chased by aliens.

The onset of junior prom stirs up emotional tumult as Liz tempts fate by asking Max to be her date, Isabel decides Alex is the man she's been searching for, and Michael tells Maria he won't take her to prom.

Brody Davis, his mind frazzled from an electric shock,holds several members of the gang hostage, when he begins to remember what happened when he was abducted, such as the New York City interstellar summit and the fact that Max is an alien. Max must use his healing abilities to fix Brody's mind so that he doesn't remember the alien mind that inhabits him. Tess must mindwarp Amy DeLuca into not remembering that Brody held them hostage.

When Liz begins to undergo some strange, alien-like changes to her body, she decides she needs to get as far from Max as she can. In order to separate from him she must leave Roswell to go to boarding school in Vermont. Meanwhile, Maria gets offered a recording contract in New York, but she isn't sure she likes what the record label people are doing to her music to make it "popular."

When the gang attempts to return to their normal lives, they soon find that their lives have gotten a lot more complicated, which includes Jesse attempting to come to terms with his newfound knowledge but matters are complicated when he finds himself under FBI scrutiny, and Max's "death" creates a unique situation within the alien authority structure, resulting in a new King...Michael.

While at the reservation Michael ends up in an alarming hallucinatory state and the others must band together to save his life.

When Max rescues his mother from a kitchen fire she faces her suspicions about his extraordinary abilities; Liz reaches out to Kyle in friendship.

Max and the others must rescue Michael after he is arrested for murder; Liz takes a job with a congresswoman who has a hidden agenda.

Brody Davis, the mysterious new curator at the UFO Museum has the group on edge, and Michael and Isabel plotting his demise.

Isabel is deeply moved when Max throws her a surprise birthday party, but she grows troubled after seeing visions of a bound and gagged Tess. Alex does an interesting cop striptease for Isabel.

After the death of congresswoman Whitaker, Max and the gang visit her hometown, Copper Summit, Arizona, where they find themselves trapped in enemy territory when they learn the whole town population are Skins.

When Isabel develops a psychic connection to a girl who has been buried alive, she races to find the teenager before it's too late. Meanwhile the FBI comes to town and starts asking questions concerning Valenti and his involvement with Max and Isabel.

Max and Liz are arrested and jailed for holding up a convenience store. Meanwhile, Isabel has a secret affair with a handsome attorney, and Michael tries to straighten out his life.

When Max is fascinated by an intriguing autistic child he wonders if his own lost child is attempting to reach out to him. Meanwhile, Michael plays Santa to Maria and Liz's elves at a charity event. Isabel and Jesse share their first holiday together as husband and wife.

Liz tries to maintain her relationship with Kyle despite her deep bond with Max; Michael is obsessed with the idea that there was another alien in Roswell in 1959 and tries to decipher the meaning of the flashes only he sees. Meanwhile, Liz suspects the new guidance counselor Ms. Topolsky is hiding something, especially when she sees her with Michael's file.

Michael and Maria flee from Roswell after helping Laurie DuPree escape from the police, and Max learns that a deadly parasite was released into Earth's atmosphere when their ship crashed 50 years ago.