Plot

An alien touring the galaxy breaks away from her group and meets two young inhabitants of the most dangerous place in the universe: the London borough of Croydon.

Enn is a shy suburban London teenager in 1977, sneaking out with his best friends to after-hours punk parties. One night they stumble upon a bizarre gathering of sexy teenagers who seem like they are from another planet. In fact, they are from another planet, visiting Earth to complete a mysterious rite of passage. That doesn't stop Enn from falling madly in love with Zan, a beautiful and rebellious alien teenager who, despite her allegiance to her strange colony, is fascinated by Enn. Together they embark on a delirious adventure through the kinetic punk rock world of 1970s London, inadvertently setting off a series of events that will lead to the ultimate showdown of punks vs. aliens, and test the limits of how far each of them will go for true love.—A24 Films

Enn, John, and Vic, three rowdy friends on their way to a loud punk concert in the 1970s suburb of Croydon, London, stumble upon a bizarre house party. Crammed with people in latex outfits, they investigate, only to realise this unconventional gathering is a commune of intergalactic visitors. As Enn becomes infatuated with Zan, a rebellious teenage girl, they embark on a wild, 48-hour field trip to broaden their horizons and learn everything about "the Punk". But is a mere weekend enough for the Boy from Earth and the Girl from the other side?—Nick Riganas

John Cameron Mitchell, director of the acclaimed films Hedwig and the Angry Inch and Shortbus takes us to an exotic and unusual world: suburban London in the late 70s. Under the spell of the Sex Pistols, every teenager in the country wants to be a punk, including our hopeless hero Enn. Hearing the local punk Queen Boadicea is throwing a party, Enn crashes the fun and discovers every horny boy's dream; gorgeous foreign exchange students. When he meets the enigmatic Zan, it's lust at first sight. But these girls have come a lot further than America. They are, in fact, aliens from another galaxy, sent to Earth to prepare for a mysterious rite of passage. When the dark secret behind the rite is revealed, our galaxy-crossed lover Enn must turn to Boadicea and her punk followers for help in order to save the alien he loves from certain death. The punks take on the aliens on the streets of London, and neither Enn nor Zan's universe will ever be the same again.—Anonymous

Young Enn (Alex Sharp) and his best friends stumble upon a bizarre gathering of teenagers who are from another planet, visiting Earth to complete a mysterious rite of passage. That doesn't stop Enn from falling madly in love with Zan (Elle Fanning), a beautiful and rebellious alien who becomes fascinated with him. Together, they embark on a delirious adventure through the kinetic, punk rock world of 1970s London, inadvertently setting off a series of events that leads to the ultimate showdown between punks and aliens.

On their way to a noisy punk concert in the 1970s humdrum London suburb of Croydon, rowdy friends--Enn, John (Ethan Lawrence), and Vic (AJ Lewis) inadvertently stumble upon something that looks like a bizarre house party, crammed with latex-clad people. Little by little, as the boys discover that this unusual gathering is actually a commune of intergalactic visitors, Enn will fall head-over-heels for the enigmatic and rebellious teenage girl, Zan.

Queen Boadicea (Nicole Kidman) is an old-school punk who manages the local punk hangout. PT Stella (Ruth Wilson) is one of the alien leaders. PT Wain (Matt Lucas) is the other one. PT Waldo (Tom Brooke), Zan's parent is also an alien leader. Zan finds out that Enn is a local and not an alien. She wants Enn to show her the world, as their own alien itinerary sounds very boring to her. she runs away from her colony and has 48 hours with Enn. Enn takes her to his home, where Zan meets his mother Marion (Joanna Scanlan), who likes her. Waldo enters Marion's body and asks Zan to return to the colony. But Zan is determined to have the unique experiences, which is what the universe tour is all about. Zan gives Enn her colony ring and tells him that she will never leave him.

PT First (Edward Petherbridge), is the alien supreme leader. Waldo conducts a vote in her presence, with fellow elders and it is decided to shun Zan from the colony. Zan is a big fan of the punk, so Enn takes her to meet Boadicea. Boadicea misunderstands when Zan says she has been a star, and she introduces Zan as a singer at her local punk-house that night. Enn saves her, by joining her on stage and both sing a song about alien rituals.

After the song, Zan tells Enn that the next day her colony will exit with the alien leaders eating the children. Enn thinks that Zan is in some mass suicide pact. The entire alien colony comes to the punk-house and Waldo tells Zan that she is danger of being left behind, if she doesn't come back. First tells Zan that she is with child. Zan comes to her senses and goes back.

Enn is helpless and begs Bodicea for help to get Zan back. Bodicea enlists all of her punk followers who attack the alien colony. But First intervenes and puts every human to sleep, but Enn is not affected. Waldo proposes that the aliens should do away with the child eating ceremony. But First says that that is the only to keep population under control, else every species simply consumes their planet. Enn counters first by saying that humans may have cocked up Earth, but at least they are alive. The leaders vote to abolish child eating, but it's a deadlock. Until Waldo reveals that Zan is also pregnant & is entitled to a vote. First agrees, but says that to exercise her vote, Zan must give birth, for which she has to exit and if she exits, she can't return. Zan decides to leave after a tearful goodbye to Enn, as she can secure the future of her entire race by using her vote.

15 years later, Enn is a graphic artist and has published a book which is a bestseller. One day he is doing a book signing when a bunch of teenagers come and introduce themselves to Enn. Enn recognizes them as Zan's kids and is tearful that she remembered him.