Matthew Rogers wrote: “While featuring six faces prominently on your poster, you appear to have forgotten to credit Katherine Waterston. You know, from Inherent Vice, Alien Covenant – and Tuppence Middleton. I can’t for the life of me figure out why?!”CNHS Film Club tweeted: “‘Power Changes Everything’ says the tagline of The Current War. But ironically couldn’t generate enough energy to include the names of the two female stars, Tuppence and Katherine Waterston, on the poster alongside the four male stars”.Tuppence Middleton, who plays Mary Edison in the film, has said she tried to make her character have a strong female voice.She told Harpers Bazaar: “The fact that she met when they were working together shows she was a modern woman, that she had a job.”Mary was a very intelligent woman, and we didn’t want her to be the supportive, meek wife, we wanted her to have her own voice and to have an effect on Edison, and to be the person at the heart of the story who drives him forward. We tried to give her a bit more of a voice.”Lantern Entertainment has been approached for comment. A new film starring Benedict Cumberbatch has found itself in the middle of a sexism row as the posters and clips advertising it show only the names of the male actors.The promotion for The Current War has been criticised for only including the names of the male leading actors – but ignoring the two women actors who are also pictured.As well as Cumberbatch, Nicholas Hoult, Michael Shannon, Tuppence Middleton, Tom Holland and Katherine Waterston also star in the feature film.The film illustrates the battle between electricity titans Thomas Edison and George Westinghouse about whose electric current would power the modern world.A clip of the film, promoted on social media, also only shows the male characters speaking. Twitter user Liz May asked: “Any female characters in this film?”Joy Whyte added: “Any women in the cast? There don’t seem to be any you want to highlight.”According to the publicity – it has four men in it, and apparently no women.”The sexist slip-up has been noticed by commuters, as the poster is plastered across train and tube stations.Leon Byrne tweeted: “There’s two women on the poster for The Current War. But neither of them are listed in the cast”. Want the best of The Telegraph direct to your email and WhatsApp? Sign up to our free twice-daily Front Page newsletter and new audio briefings.