If you were hoping to watch Episode 3 of the new series "Lucky 7," you were about the only one.ABC canceled it after the ratings for Episode 1 were bad and the ratings for Episode 2 were worse.Ah, well. At least "Lucky 7" will be the answer to a trivia question: What was the first show canceled in the 2013-14 TV season?And, quite frankly, it wasn't a good show.Until ABC figures out what to do with the time slot, it will air repeats of Scandal (9 p.m., Ch. 4). So if you missed the episode that aired on Thursday, Oct. 3, here's a chance to catch up.Also tonight, it's the chilling Frontline (8 p.m., KUED/Ch.7) documentary "League of Denial: The NFL's Concussion Crisis."It makes the NFL look terrible, because the league not only hid information about the danger of head injuries but actively tried to discredit research that indicated that was true. And it's a wake-up call for parents of any child who wants to play football.Elsewhere on TV ...Baseball playoffs: Oakland Athletics at Detroit Tigers (3 p.m., TBS); Boston Red Sox at Tampa Bay Rays (6:30 p.m., TBS)NCIS (7 p.m., CBS/Ch. 2): A Navy lieutenant disappears.Marvel's Agents of S.H.I.E.L.D. (7 p.m., ABC/Ch. 4): The team tries to rescue a kidnapped scientist.The Originals (7 p.m., CW/Ch. 30): Rebekah arrives in New Orleans.NBA preseason (7 p.m., ROOT): Golden State Warriors at Utah JazzBrooklyn Nine-Nine (7:30 p.m., Fox/Ch. 13): Jake hits on a medical examiner at a crime scene.NCIS: Los Angeles (8 p.m., CBS/Ch. 2): A classified vaccine program is jeapordized.The Goldbergs (8 p.m., ABC/Ch.4): Barry gets a job.The Voice (8 p.m., NBC/Ch. 5): A look back at the best of the blind auditions.New Girl (8 p.m., Fox/Ch. 13): Schmidt tries to ruin Jess and Nick's relationship.Supernatural (8 p.m., CW/Ch. 30): Dean tries to make a deal with an angel to save Sam's life. (Season premiere)Trophy Wife (8:30 p.m., ABC/Ch. 4): Albert gets too involved in Jackie's career.The Mindy Project (8:30 p.m., Fox/Ch. 13): Morgan sues Mindy for sexual harassment.Person of Interest (9 p.m., CBS/Ch. 2): Root plots an escape from the psych ward with the help of the machine.Chicago Fire (9 p.m., NBC/Ch. 5): Severide is certain he knows who the arsonist is.Sons of Anarchy (11 p.m., FX): The club is forced into an uneasy alliance.