CBS begins a season of one reality show tonight and ends another.Survivor: Blood vs. Water (7 p.m., CBS/Ch. 2) features 10 returning contestants (including Utahn Tyson Apostol) competing against their loved ones (including Tyson's girlfriend, Rachel Foulger).And, by the way, the premiere is 90 minutes long, so it won't end until 8:30 p.m.At that point, Big Brother (8:30 p.m., CBS/Ch. 2) takes over. And we find out who the winner is.As far as I'm concerned, they're all losers. Either they were racists or homophobes or misogynists, or they didn't call out the racists or homophobes or misogynists. I'm not a fan of this show to begin with, but the behavior this season speaks to the need to screen these idiots better before you let them on national TV.Elsewhere on TV ...The Million Second Quiz (7 p.m., NBC/Ch. 5): Day 9 of the 12-day event.The X Factor (7 p.m., Fox/Ch. 13): Auditions continue.America's Got Talent (8 p.m., NBC/Ch. 5): A winner is declared in the season finale.Broadchurch (8 and 11 p.m., BBC America): Time is running out to solve the murder.It's Always Sunny in Philadelphia (8 p.m., FXX): The gang tries to give customers what they want.The Bridge (11 p.m., FX): The killer reveals his endgame.Key & Peele (11:30 p.m., Comedy Central): Sketches in the season premiere of this often hilarious show include the return of Mr. Garvey.