Airing on NBC tonight is THE ADVENTURES OF SEINFELD & SUPERMAN from 8:44-9 pm. The live-action/animated combo will be hawking American Express in this odd sweeps month programming stunt. The special will be comprised of the first Seinfeld/Superman webisode “A Uniform Used To Mean Something,” which premiered online a couple months ago, as well as the premiere of the second installment called “Hindsight.”