22-year-old Sigrid - called Sigge - and her group of friends are confronted with the unexpected demands of adulthood while trying to come to terms with their own identities, their passions and the past.
Sigge has love problems and tries to seek comfort from Antonia. At the same time, Sigge's father sends encouraging messages to Sigge and her little brother who are waiting for him to go to the cinema with him.
Sigge gets an unpleasant surprise at the health center and now has to confront Edwin. Stefan shows up at Sigge's job and unexpectedly asks her for help. Meanwhile, Sigge's mother Annika goes on a date.
Sigge's life situation changes drastically, and she, Antonia and Sam decide to go out and get drunk, whereupon Antonia disappears and Sigge scolds the wrong person. Stefan's messages keep coming.
Sigge confides in Sam about her problems, and their relationship reaches a new level. Sigge comes home to Antonia unannounced, which has major consequences for both Antonia and Sigge.
Sigge and Benjamin help their mother get rid of memories before selling the townhouse. The gang goes to Gröna Lund to find their inner child, and Sam and Sigge do not quite know where they have each other.
Sigge goes to Västerås to find her father Stefan, who still owes her money. Meanwhile, Sam is worried that something has happened to her. Antonia tries to solve the situation with Janice.
Sigge, who can no longer afford to pay his rent, moves in with Antonia. In the apartment, Sam and Sigge get an evening to themselves. Annika ends up in a dilemma that she does not know how to handle.
After experiencing the consequences of adulthood, Sigge finally decides to tackle her past. Sam does not answer the phone and Sigge wonders if she has ruined their friendship forever ....
Both Sam and Antonia are in stable, happy relationships and Sigge is clearly the fifth wheel. The friends have a wine tasting in Sam and his girlfriend Louise's beautiful apartment and Sigge feels how wrong she is.
The friends celebrate Sam's birthday at Louise's country house. Antonia is triggered by Janice's frequent disappearances from the toilet. Louise finds out about Sigge and Sam's past, which tests Sam and Sigge's friendship.
Benjamin lures Sigge to a playground on Father's Day, where an encounter leads to a panic attack. Sigge finds out that the whole gang is at Sam's dad's house for dinner and no one has invited her.
Annika's attempt to bring Benjamin home fails and Annika, Stefan and Benjamin are summoned to family court. Sam and Alex carry a huge debt after Zayn's decision. Sigge is left alone with the rabbits.
Sigge tries to reach Benjamin, who has shut her and Annika out. Benjamin finally gets to live with his dad, but it's not as fun as he thought. Sam disappears and the friends are looking for him, all except Sigge...
Sigge, left alone with a screaming baby and great sadness, tries to process what happened to Sam and what it might mean. Benjamin runs away from school. Antonia starts going to therapy.
The gang gathers to say goodbye to Sam's dad. Sam and Sigge don't know what to say to each other after everything that happened. Stefan requests sole custody of Benjamin - how will Sigge save his little brother?
The family meets in court to settle who will have custody of Benjamin. Sam asks Sigge to come to his father's house, which is now for sale. He has something he wants to tell her.
Complete episode guide for Thunder in my heart with detailed information about every season and episode including air dates, summaries, ratings, and streaming availability in Israel.
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