The Dow fell 650 points and Jim Cramer's parsing through today's tape to help you find areas of opportunity in this market. Then after pulling back today, have investors spotted a buying opportunity in Plug Power? Cramer's going one-on-one with the company's CEO to learn more about the future of hydrogen fuel cells. Plus in a sea of red, Cramer's found a glimmer of green in AEP. Could today's performance be a sign of what's to come for the stock? Cramer's talking renewable energy and the future of the industry with the company's top brass.