Socially awkward young Muriel Heslop is the target of ridicule by her shallow and snobbish friends, Tania, Cheryl, Janine and Nicole. A devoted
ABBA fan, she often daydreams of a glamorous wedding to get her away from the dead-end beach town of Porpoise Spit and her domineering father Bill, a corrupt politician who constantly belittles his entire family. Muriel attends the wedding of Tania and Chook, during which she sees him and Nicole secretly having sex. Wedding guest Dianne, a department
store detective, calls the police on Muriel for stealing the dress she is wearing, and they publicly escort Muriel out of the reception. Soon afterwards, Bill's rumoured mistress, Deidre Chambers, recruits Muriel into her
multi-level marketing business, and Muriel's "friends" throw her out of their group after declaring she is not invited to their upcoming island holiday. Muriel's mother, Betty, signs a blank cheque for Muriel to buy products for the cosmetics business, but she instead uses it to withdraw $12,000 and follow her former friends to the island. There, Muriel runs into Rhonda Epinstall, an old high school acquaintance, and they quickly strike up a friendship, cemented when Rhonda gleefully tells Tania about Nicole and Chook's affair. Returning home, Muriel is confronted by Betty regarding the stolen money. She impulsively flees to Sydney, sharing a flat with Rhonda, taking a job at a
video shop and changing her name to Mariel. One night, Rhonda suddenly falls down, unable to feel her legs. While at the hospital, Muriel calls home and learns her father is being investigated for
taking bribes. Rhonda has a cancerous
tumour in her spine and undergoes multiple operations, eventually leaving her paraplegic. Muriel promises Rhonda to look after her and never let her return to Porpoise Spit. She also uses Rhonda's health crisis to obtain pampered service at numerous bridal shops, trying on wedding dresses and taking photographs to indulge her wedding obsession. When Rhonda confronts Muriel, she finally confesses to her fixation on a dream wedding, and their friendship becomes strained. Desperate, Muriel agrees to a
sham marriage to South African swimmer David Van Arkle so he can join the
Australian team in the
upcoming Olympics; she is paid $10,000 by David's parents for her help. At Muriel's elaborate wedding in Sydney, Tania, Cheryl and Janine are her bridesmaids; an embittered Rhonda refuses to be one. Bill openly treats Deidre as his date, and Betty arrives late to the wedding as she is unable to afford a plane ticket; Muriel does not notice her at the wedding. Rhonda moves back to her mother's home in Porpoise Spit, unable to live in Sydney without help. After the wedding, David makes his lack of interest in Muriel clear to her. In Porpoise Spit, an increasingly distraught Betty unwittingly shoplifts a pair of sandals she tries on, and Dianne calls the police. Bill arranges to have the charges dropped, but when Betty pleads with Bill for help, he announces his intention to divorce her and marry Deidre. Betty is later found dead by her daughter Joanie. It is announced that Betty had a heart attack, but Joanie informs Muriel that it was suicide. At her mother's funeral, David comforts Muriel, and they finally consummate their marriage. Determined to stop lying, she tells him she can no longer remain married to him as neither of them are in love, and they part amicably. Bill asks Muriel to help raise her siblings, as Deidre is less likely to marry him with the children in tow, and he has also lost his job on city council. Muriel stands up to him, giving him $5,000 of her wedding money and telling him she will repay the rest of the stolen amount when she gets a job in Sydney. She also demands that her father stop verbally abusing her siblings. Muriel goes to Rhonda's house, where Muriel's former tormentors are visiting, and offers to take her back to Sydney. Rhonda accepts and lambasts the other women, much to their shock and anger. The best friends head to the airport, happily leaving Porpoise Spit behind. ==Cast==