Super loner Dylan would rather stay at home playing his favourite end-of-the-world video game or trying to write his novel, but when his womanising housemate Jack drags him out to Wind Street, it goes horribly awry and Dylan catastrophises himself to the edge of a bridge. He’s about to jump, until he's interrupted by a passing stranger, Emily. 

 

Emily talks him down. She walks him home, where it then transpires that she is experiencing homelessness, and Dylan convinces her to stay with him that night - to say thank you.

 

Meanwhile, Jack gets caught cheating by his insecure influencer girlfriend Blake. He manages to gaslight her into believing that he’s completely committed and somehow Dylan was to blame for the misunderstanding, which spirals into Blake pumping out humiliating memes about Dylan through her platform.

 

Dylan and Emily bond more and more - Emily ends up writing a grant application for his book, and Dylan reunites her with her brother Matt, though the siblings’ complicated family history makes for a tumultuous meeting. 

 

As Dylan and Emily’s feelings spill over, Blake receives a message from a fan who works for the grant Dylan’s applied to and has recognised him from Blake's memes. Still blaming Dylan for Jack’s misdeeds, she tells the fan to reject the application.

 

After finding out more about the story of Dylan’s novel and him casually dropping that he loves her, Emily becomes worried that Dylan is too dependent and projecting unrealistic expectations on her. Scared for the damage she might do to them both if it continues, she sneaks away in the middle of the night.

 

Blake’s actions catch up to her, and she's forced to come clean to Dylan and apologise to him and her followers.

 

Her apology is overshadowed, however, by the breaking news that the moon is on a collision course with Earth - specifically Swansea. It’s the exact apocalypse scenario from Dylan’s favourite video game, and therefore he’s certain it must be his fault, causing a spiral of catastrophising.

 

Blake wants to spend her final hours with Jack, but he’d rather go out and try to pull as much as possible before doomsday. At last seeing through his facade, Blake is overwhelmed, lashes out, and ends up assaulting him. With nowhere else to turn, Emily tries one last time to reconcile with Matt, but they're at loggerheads when it turns out that he's an anti-mooner, believing it's a government hoax.

 

Seeking refuge from Blake, Jack ends up having a heart to heart with Dylan. Dylan finally holds him to account for his behaviour, and accepts that he needs to get help for his mental health.

 

As the moon falls ever closer, everyone is desperate not to be alone at the end of the world. Emily’s come back for Dylan but he can’t overlook how she disappeared without a trace. Matt can’t stop blaming Emily for past traumas. And Jack finds a broken Blake at the edge of the same bridge Dylan was at, unable to forgive herself for her actions.

 

In a supernova of thought, Dylan decides to fight, trying to hold up the moon and prevent it from falling. It inspires a chain reaction of reconciliations.

 

Matt and Emily find the means to let go of their past and start afresh. Jack is able to talk Blake down, and convince her that all the misdoings were his. Dylan and Emily acknowledge the flaws that drove them apart but thank each other for what they found together.

 

They all in turn help to hold up the moon and prevent the apocalypse, ready to create something new.