TODAY’S HIGHLIGHTS

changed the course of history, scrambling the global geopolitical order and persuading American political leaders to compromise long-held principles out of fear of another attack. The U.S. response to that horrifying day not only transformed the Middle East, but America itself, and in very fundamental respects. As the 20th anniversary of those attacks approaches, this special episode looks at how 9/11 affected actions by four U.S. presidents.

9PM G Supergirl When a building in the Heights that is designated for low-income housing suddenly goes on the market for a major corporation, Supergirl (Melissa Benoist) recruits Orlando

(guest star Jhaleil Swaby) to help her convince the city to halt the prospective sale in the new episode “Still I Rise.” Her plans go awry, though, when Nyxly (Peta Sergeant) shows up. Elsewhere, Nia (Nicole Maines) trains with her mother (guest star Kate Burton).

9:02 PM (MTV) Teen Mom: Young and Pregnant In the season opener “Long Time No See,” after investing a lot of time and energy trying to convince her mother that Hazelee’s dad, Drew, is really going to rehab this time, Rachel is understandably dismayed to find out that he was recently arrested.

10 PM (FX) Impeachment: American

Crime Story Based on a critically acclaimed nonfiction book by Jeffrey Toobin, Season 3 of this docudrama anthology revolves around the impeachment of President Bill Clinton, especially as relating to the Monica Lewinsky scandal. British actor Clive Owen plays the beleaguered president, with Edie Falco as Hillary Clinton. Beanie Feldstein (“Booksmart”) plays Lewinsky, Sarah Paulson portrays Linda Tripp and Annaleigh Ashford

(“B Positive”) is Clinton accuser Paula Jones. Rounding out the cast are Billy Eichner as rightwing online newshound Matt Drudge and Margo Martindale as literary agent Lucianne Goldberg.