Comedy doesn't often age well, but the exceptions to that rule can be extraordinary. One of the most glaring is the Marx Brothers, whose best work somehow seems as fresh on the 10th viewing, over 60 years later, as it does on the first. That fact doesn't negate the thrill of seeing new material, which makes this 1993 documentary a treat. Though it tries to be both, The Unknown Marx Brothers functions better as a collection of rare clips than as a history of the Marx Brothers. Not that it's a bad overview; it's just a sketchy one that isn't helped by uninspired narration by a tired-sounding Leslie Nielsen. The unearthed footage, from a long-lost appearance by Harpo Marx in, appropriately, a 1925 silent film, to Groucho's appearance on The New Bill Cosby Show in the early '70s, nicely fleshes out testimonials from friends, colleagues and co-workers. Some of this material is funny, such as chaotic outtakes from You Bet Your Life, while some is perversely fascinating, like clips from the disastrous 1959 attempt at a television show featuring Groucho, Harpo and Chico as comedic angels. While The Unknown Marx Brothers hardly puts its subjects' genius in perspective, and rarely shows them at their best—try Duck Soup, Monkey Business, or nearly any of their films from the '30s for that—it is, like its rare footage, a good find.