Bill attempts to sign the deal on the video poker devices before Roman. Joey and Wanda are having a rough patch and Joey wants Barb to help them. Meanwhile, Nicki's upset with the Catholic summer school Wayne is attending. Finally, Bill is captivated by a pretty waitress.

Margene plots to introduce Barb and Nicki to Bill's next potential wife. Meanwhile, journalists take an interest in Rhonda's story.

In the season finale, the family prepares for the annual Pioneer Week. Bill and Alby butt heads over the control of UEB. Meanwhile, Margene reveals the truth to Ana.

Bill wants to add a Native American businessman as a partner for his casino and sniffs for a clue of why his family has been snubbed for a big upcoming block party. Meanwhile, Barb would love to add Ana to the fold, and Adaleen has Nicki doing some spying for her. Also, Alby's secret life has gotten him in trouble.

The family dates Ana as a group. Barb awaits test results and takes steps to address Nicki's apparent infertility. With Margene by his side, Bill pursues the casino. Sarah makes plans to go to school out of state, but encounters obstacles. Don is forced into monogamy. Roman attempts to blackmail Bill into finding Rhonda. Frank introduces new wife Jodean to Lois, with explosive results.

Roman's upcoming trial creates more headaches for the Henricksons as Bill worries about Rhonda's plans to testify, the involvement of Joey's family and shocking news about Nicki's past. Meanwhile, Barb has another contentious reunion with her sister; Margene copes with a family tragedy; and Sarah changes her mind about attending her senior prom.

Bill attempts to drive a wedge between Alby and Roman, whose case finally goes to trial. Struggling with the decision of what to do regarding her pregnancy, Sarah recruits Heather and Ben for moral support.

Sarah, Ben, Heather and Frankie attempt a risky mission to Juniper Creek to find Frankie's mother; the Henricksons adjust to cramped living conditions after a recent arrival; Bill turns to his brother-in-law for help in securing a loan; Nicki mulls going back to her job at the DA's office; Roman hints at plans for a comeback.

Ana resurfaces with a surprise revelation. Meanwhile, Bill tries to get Tommy and Jerry to rebrand the casino; Marilyn makes yet another impressive pitch; Lois and Frank take Ben and Jodean south of the border; Nicki is infuriated by Alby; Margene worries about her booming business; and, with a flourish, Bill shows his wives the family's collective future.

With a revenge-minded Joey in tow, Bill makes an emergency trip to Mexico after Lois and Frank's latest smuggling escapade backfires. Nicki is jolted by a doctor's news, but even more flummoxed by Adaleen's shocking revelation. Margene offers up a novel remedy to keep Ana from leaving the country with her fiance, Goran. A bomb scare rocks the casino.

Sarah makes an announcement that shakes up the family; Nicki tries a new look; Margene is put on the defensive when Bill questions her real reasons for getting married. An ill-timed remark puts Barb in an unwanted spotlight; an exposed Marilyn looks to bring down Bill; Bill looks for clues about J.J. in Kansas, while Adaleen finds them closer to home.

With the election only days away, Bill puts the squeeze on Paley to protect his candidacy. But Marilyn has an ace up her sleeve that threatens to wreck Bill's chances. Meanwhile, Nicki gets news that seems too good to be true; and a late-breaking polygamist scandal forces Bill and his three wives to rethink their bold post-election plans.

After being elected state senator, Bill Henrikson announces that he is a polygamist, and he and his families are attacked from every side; Alby Grant returns from living in the desert with the idea of purifying the compound and getting revenge.

After revealing his polygamy to the world the newly elected Bill goes even further out on a limb by calling publicly for more polygamists to come into the open while Barb talks Nancy, her mother, into attending a mother-daughter symposium.