With the Muppets melting hearts all over again on the big screen, it is a nice moment for this sweet-natured documentary about Kevin Clash, the puppeteer regarded as dauphin to the late Jim Henson; Clash is the man who created the much-loved Elmo character on Sesame Street, a wacky figure whose celeb importance is such that he is described here as the Brad Pitt for five-year-olds. The movie takes us through Clash's tough childhood in Baltimore, his early interest in puppetry, and the liberating experience of seeing the TV show Sesame Street with its inspired repudiation of racism. Director Constance Marks shows how Clash developed Henson's characterisation techniques, with the puppets' distinctive ruminative "nodding" style, making them appear to be thinking and reacting without needing to speak. The film passes a little lightly over Clash's personal life; despite the title, we don't dwell on his immersion in Elmo's personality – and those hoping to find something dysfunctional about his closeness to the Elmo persona will be disappointed. He simply seems to be a good guy who created something that little children love. Fair enough.