Sometimes the most powerful stories demand to be told creatively. Graphic storytelling is increasingly being used to convey emotion, surprise audiences and sometimes, to protect people’s identities. This was the case for Abike’s story, a comic produced for the Guardian to tell the true story of a Nigerian woman trafficked to the UK for sexual exploitation. The graphic story was produced by Benjamin Dix, founder of literary comic agency PositiveNegatives, and illustrated by artist Gabi Frödén.

Dix says telling Abike’s story in graphic form helped bring the unimaginable to life: “Abike’s story is one of the darkest and most chilling testimonies that I’ve heard. The graphic form shows us that nightmare, not just through narrative, but we actually see it and feel it.”

Now we want to see your work. The Guardian has brought together an incredible review panel; cartoonist, Joe Sacco; human rights campaigner, Bianca Jagger; comics historian, Paul Gravett, graphic novelist, Amruta Patil; writer and curator, John Dunning and Benjamin Dix, who all share a passion for comics and their power to tell important and compelling stories.

Sacco explains why he got involved the #OpenComics project. “The thing comics have is the visceral, visual kick to take a reader to a time and a place immediately,” he says. “They have the possibility, through multiple images, to build up a complete world, be it physical or psychological. They are subversive as few artforms are.”

We’re looking for interesting untold stories from around the world. The subject you choose is up to you – we simply want to see stories that you think are important and that are best told through graphic storytelling. It could be a weighty international issue such as freedom of speech and human rights, or it could be a more personal story about your community or something that affects you as an individual.

You don’t have to be a professional; it’s the story that matters. Though for the more professional among you, do think about entering the Jonathan Cape/Observer/Comica graphic short story prize.

Though we love cartoons, for this assignment we would prefer that you tell us a narrative, so consider the following (and only) rule for entry:

• Submit one page, made up of as many panels as you like

The reviewers will look at your work and the best content will be published in Observer New Review and on the Guardian site. All reviewed content will appear on GuardianWitness. This assignment will close on 24 September 2015.

You can share your comics with GuardianWitness by clicking on the blue “Contribute” buttons on this article. You can also use the GuardianWitness smartphone app or the Guardian app and search for “GuardianWitness assignments” – everything that is submitted to us is reviewed before it’s published on GuardianWitness, so please be patient if you haven’t seen your contribution appear.

• GuardianWitness is the home of readers’ content on the Guardian. Contribute your video, pictures and stories, and browse news, reviews and creations submitted by others. Posts will be reviewed prior to publication on GuardianWitness, and the best pieces will feature on the Guardian site.