The Dow and S&P fell while the Nasdaq finished higher and Jim Cramer is helping investors through today's mixed market. First, Cramer's going one-on-one with General Motors CEO Mary Barra to talk about the company's expansion into the electric vehicle market. Next, Cramer is digging deeper into some the market’s biggest names that are trading below their 2019 levels to see if they're worth taking a closer look at. Plus, Cramer's exclusive with Plug Power.