“Justice League Unlimited,” a direct spinoff of the “Justice League” series, launched on Boomerang’s Boomeraction franchise starting Sunday, June 3. The 30-minute action adventure series features superheroes from the original Cartoon Network series such as Superman, Batman, Wonder Woman, and the Green Lantern, along with famous superheroes like Green Arrow, Supergirl, and Captain Atom. Other members may be a bit more obscure like Hawk & Dove, siblings with a very different take on conflict resolution techniques; B’wana Beast, a jungle man-turned-superhero; The Atom, the world’s smallest superhero; Booster Gold, a glory-seeking hero from the future; and Zatanna, a beautiful magician and sorceress. A few classic villains return, including Lex Luthor, Soloman Grundy, and Mongul.