Supergirl 8pm New
When Jeremiah Danvers (guest star Dean Cain) is rescued from Cadmus, Alex and Kara are thrilled to have their father back. The Danvers arrange a family dinner to celebrate, but things go awry when a suspicious Mon-El starts to question Jeremiah about his sudden return.
Jane the Virgin 9pm New
When Jane messes up at Mateo’s school, Petra convinces Jane to help with the preschool fundraiser to get in the good graces of the preschool’s director. Jane is excited for her first meeting with her editor, but he’s definitely not what she expected. Rafael’s girlfriend Abbey (guest star Minka Kelly) suggests moving in together, but Rafael seems a little hesitant and turns to Petra and Jane for advice. Petra is hiding a new relationship, but that’s not the only secret she’s keeping. Rogelio is being sued after quitting his reality show and hires a lawyer to help fix things, but when the lawyer makes things worse he turns to Bruce (guest star Ricardo Chavira) for help. Meanwhile, Bruce asks Jane and Alba for help in surprising Xo.
The Flash 8pm New
When Grodd (voiced by David Sobolov) and his army of gorillas bring the battle to Earth-1, The Flash and team must find a way to stop them before they destroy Central City. Gypsy (guest star Jessica Camacho) returns to join the fight. Meanwhile, Jesse Quick (guest star Violett Beane) decides she wants to stay with Wally on Earth-1.
As a new school year begins, the town of Riverdale is reeling from the tragic death of high school golden boy Jason Blossom. Archie Andrews is still the all-American teen, but the summer’s events made him realize that he wants to pursue a career in music—not follow in his dad Fred’s footsteps—despite his forbidden relationship with Riverdale’s young music teacher, Ms. Grundy (guest star Sarah Habel). With the weight of the world on his shoulders, Archie must look for a new music mentor and turns to Josie McCoy, but she is focused solely on her band Josie and the Pussycats. Weighing heavily on his mind is also his fractured friendship with budding writer Jughead Jones. Meanwhile, girl-next-door Betty Cooper is anxious to see her crush Archie after being away all summer, but she’s not quite ready to reveal her true feelings to him. And Betty’s nerves, which are hardly soothed by her overbearing mother Alice, aren’t the only thing holding her back. When a new student, Veronica Lodge, arrives in town from New York with her mother Hermione, there’s an undeniable spark between her and Archie; but Veronica doesn’t want to risk her new friendship with Betty. And then there’s Cheryl Blossom, Riverdale’s Queen Bee, who is happy to stir up trouble amongst the others even though she’s keeping a few secrets of her own.
Arrow 8pm New
Oliver faces his biggest challenge yet as mayor. Felicity continues down her dark path with Helix. After Vigilante attacks Oliver while he’s acting as the mayor, Diggle leads the team in a mission to stop Vigilante once and for all.
The 100 9pm New
Clarke makes a desperate plea with a former allied force in an attempt to avoid a war and ensure the survival of her people.
Supernatural 8pm New
A chance to take out a nest of vampires backfires when the alpha-vamp shows up and turns the tables on Mary (guest star Samantha Smith) and The British Men of Letters, who are doing their best to recruit Sam and Dean.
Riverdale 9pm New
With Riverdale High’s annual variety show around the corner, Valerie’s (guest star Hayley Law) efforts to help Archie prepare for his big performance lead to some major fallout between her and Josie. Meanwhile, Betty and Jughead’s investigation into Jason’s death brings them to a home for troubled youth and face-to-face with Polly (guest star Tiera Skovbye). Just as her relationship with her mother was on the upswing, an unexpected betrayal sends Veronica spiraling, while Josie deals with her own pressures at home after her overbearing father returns for her performance at the variety show. Finally, Hermoine’s first day at Andrew’s Construction finds her and Fred growing closer.
The Vampire Diaries 8pm New
A wedding is quickly planned in order for Damon and Stefan to lure a dangerous enemy out into the open. This looming threat puts the fate of Mystic Falls in eminent danger and must be destroyed.
Reign 9pm New
When Lord Darnley surprises Mary with a visit in Scotland, Mary sees a glimmer of a union that could be more than just political. Elizabeth fights to gain allies in her favor, and Catherine must work to get Claude back on track by finding her a new husband.
The CW Primetime Movie: Blue Streak 8pm
A former convict poses as a cop to retrieve a diamond he stole years ago.
An intoxicated college student discovers the dead body of a Secret Service agent just before a scheduled presidential visit to the area; former intern Dr. Colin Fisher leads the investigation while Brennan battles a case of the flu.
The CW Primetime Movie: Breakin’ All the Rules 8pm
Inspired by his fiancée who dumped him, a man publishes a break-up hand-book for men, becoming a best-selling author in the process.
Chandler and Janice reach a turning point in their relationship; the Ugly Naked Guy may be dead.