Legendary TV producer Norman Lear continues his investigation into the gentrification of New York City and goes undercover to expose racial discrimination in housing; actress Rosario Dawson reveals new information on the Flint water crisis; and "Grey's Anatomy" star and former teacher Jesse Williams travels to Pinellas County, Florida, to investigate the roots of one of the most unequal school systems in the country.

• Peter Sarsgaard
• Amy Poehler
• America Ferrera