8 p.m. on CBS – Season Premiere
Executive producer Mark Burnett’s granddaddy of reality competition shows made its CBS premiere on May 31, 2000, and this new 40th edition, dubbed “Winners at War,” marks the upcoming 20th anniversary in memorable style: by reassembling 20 winners from past seasons to battle it out in Fiji for a $2 million jackpot, the largest in the show’s history. Sandra Diaz-Twine and Boston Rob Mariano, mentors in Season 39, return to compete, along with Ethan Zohn, Amber Mariano, Parvati Shallow, Yul Kwon, Tyson Apostol and Danni Boatwright, among others.
Concerned about what his life after high school graduation might hold in store for him, Archie (KJ Apa) seeks advice from an unlikely mentor: Hiram Lodge (Mark Consuelos), in the new episode “Chapter Seventy: The Ides of March.” Meanwhile, tragic news about someone close to her sends Veronica (Camila Mendes) into a spiral. Elsewhere, Jughead’s (Cole Sprouse) future at Stonewall Prep is jeopardized by harsh accusations against him. Lili Reinhart, Casey Cott and Madelaine Petsch also star.
8 p.m. ET on SMITHSONIAN – Premiere
Wildlife filmmakers Nathan Pilcher and Sam Davies chronicle a white-knuckle fight for survival between two long-established prides of Zambian lions and an aggressive new gang of young males determined to take over new territory in this new docuseries. The premiere, “The Invasion Begins,” introduces the two older prides: the MK pride, which dominates the land south of the Luangwa River, and the Hollywood pride, six females who peacefully coexist to the north. Their calm is shattered by the arrival of the Nomads, young male invaders.
9 p.m. ET on FREEFORM
Lucia (Emily Tosta) finds a bold new voice for herself as she organizes a fundraiser at the restaurant in a new episode called “Speak for Yourself.” Beto (Niko Guardado) goes behind Ella’s (Audrey Gerthoffer) back, while Emilio (Brandon Larracuente) tries to navigate an unsettling identity crisis. Val (Elle Paris Legaspi) struggles to maintain her false identity, only to be outed to a member of the family.