Best of Luck Nikki - Season 4 (2015)

Rohan and Sunny take Bobby to the park where a bet leads to Rohan getting stuck in the baby swing. Avatar tries to get around Nikki's pre-school guidelines which prohibit him from wearing sleepwear when dropping off Nikki.

Dolly struggles to write an essay about her life for college enrollment. A student from Sunny's elementary school asks for his advice to prank a teacher. Rohan reluctantly goes with Avatar to a Bandar Bana Macho (BBM) Concert.

Himani and Kaamini argue about who has been teaching their daughters rude language and come to realize that the bad influence is due to Roli Aunty. Sunny convinces Rohan to pretend to be his legal guardian, to avoid showing their parents his report card.

Rohan is unenthusiastic about reading Nikki her favorite book, but instantly gets hooked with the story. Dolly decides to date again but her new guy looks very much like her ex, Ayaan. Avatar goes clothes shopping with Sunny and accidentally buys him a girl's shirt, causing Sunny embarrassment at school. To prove it doesn't matter what other people think, Avatar wears a girl shirt himself but then finds out he has a company meeting that day.

Dolly throws a sleepover at Rohan's apartment, while Rohan and Popi take care of their neighbor's pet rat. One of Avatar's employees quits to start his own business, so Avatar hires a teenager named Aavishkaar as a replacement. Himani and Roli Aunty use Sunny and Riya to trick each other to do their chores but the tables turn when the children find out.

Rohan and his catering college classmate Vinnie have a misunderstanding. Sunny and his friend use Bobby's face for advertising; to avoid family finding out they sign another contract to act in an advertisement for a Dhaaba as girls.

Himani goes overboard with Nikki's birthday party. Dolly answers the phone at Avatar's company and helps Aavishkaar to break up with his long-distance girlfriend. Sunny is sent home from school after accidentally getting into a fight and gains a reputation as the tough guy in school.

Avishkaar cons and takes Dolly out where she tries to prove that she is not boring by dancing in Rajasthani style. Rohan stains the new sofa whilst in charge of the kids at home leading to panic.

The family and Aavishkaar celebrate Dolly's 21st birthday party, but Ayaan shows up and confesses that he has feelings for Dolly, which pressures her into choosing between Ayaan and Aavishkaar. In the end, Dolly chooses Aavishkaar because her relationship with Ayaan was too difficult. Rohan's cooking instructor pretends to enjoy everything Rohan does in order to get a good review on a teacher evaluation.

Missing an artists association function due to Himani's pregnancy, Avatar hosts the party at their home. Rohan caters for the event. Dolly is glad she doesn't have to attend until Aavishkaar asks her. The night takes a turn for the worse when Aavishkaar's aunt turns out to be a former hospital co-worker Himani can't stand; they have an argument that turns into a food fight. Meanwhile, Sunny gets movie tickets but Riya has gone out with her family so he reluctantly takes Roli Aunty instead, and they get kicked out of the theatre due to her loud talking.

Just as Avatar and Aavishkaar become closer, Aavishkaar gets a job offer in his hometown of Ahmedabad and has to say goodbye to Dolly and Avatar. Rohan and Popi search for a new roommate to share their household expenses. Sunny tries to get Himani's much-delayed news segment on the air, so she will stop intruding on his time with Riya.

On account of Diwali, the Singhs decorate their house like the palace but it turns out to get disastrous results.

Riya wants to talk to Sunny about their relationship, and Dolly suggests she might want to break up. Sunny follows her and breaks up. But at last Dolly, manages everything.

On a Amavasya day, Sunny and Rohan get scared by their neighbor. Dolly and Pam throw Ravi into a manhole and film it as a ghost.

Rohan and Dolly go to Mumbai Film Institute before New Year and meanwhile they couldn't celebrate it as Rohan went to a vada pav shop and became the chef.

Dolly has bad luck since everyone thinks she is promiscuous. Meanwhile Sunny and Avatar impersonate Arun and Varun Shastri to get into a restaurant, and get into trouble when the actual people come.

Daisy Aunt, Singh's neighbor was getting married with Meren Uncle but Daisy aunty did not know cooking. Dolly and Rohan helped her to manage.

Sunny participates in a play and tries to hide it from Himani.

Someone is repeatedly throwing eggs in the neighbor of Singhs, so a group of Daisy Aunty, Meren Uncle, Avatar, Rohan, and Damini forms a group called Shastri Nagar Police Commission to investigate who is the Andebaaz and with effort, Daisy Aunty tells that she has done the hazard.

Himani suspiciously starts to produce lovely dishes, paying Rohan to let her take the credit. Sunny learns that Rohan and Popi were evicted for not paying their rent and are staying in the treehouse. Avatar learns of this and agrees to pay.

Rohan gets a cooking project and Dolly and Neeti get a reporting project but both of them forget to submit their work to Aaram Radio. Meanwhile, by mistake Rohan takes Nikki's drawing project cook institute. Dolly and Neeti get bored at the station and soon gets duty to dictate. Dolly and Neeti just rock-and-roll. The director sees them and throws them out of the station. Meanwhile, Nikki goes to Rohan's institute and tells chef that Rohan had done a mistake and should give one more chance. At last, Neeti, Rohan and Dolly gets passed in projects somehow.