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It's a super crossover tonight on "Supergirl" (7 p.m., CBS/Ch. 2) — the Flash (Grant Gustin) accidentally ends up in Kara's (Melissa Benoist) universe and helps her battle Silver Banshee and Livewire.

It's something comic book geeks and fans of both shows have been waiting to see. And something that doesn't happen all that often — a crossover from one network to another.

Elsewhere on TV ...

• NBA (7 p.m., ROOT): Los Angeles Lakers at Utah Jazz

• "Supergirl" (7 p.m., CBS/Ch. 2): Kara gains a new ally when the Flash (Grant Gustin) suddenly appears from an alternate universe and helps Kara battle Silver Banshee and Livewire.

• "Dancing with the Stars" (7 p.m., ABC/Ch. 4): One pair is eliminated.

• "The Voice" (7 p.m., NBC/Ch. 5): The knockout rounds continue.

• "Gotham" (7 p.m., Fox/Ch. 13): Gordon faces new threats inside the prison; Penguin grows closer to his father.

• "Crazy Ex-Girlfriend" (7 p.m., CW/Ch. 30): When Josh's asks her to be a bridesmaid, Rebecca decides to make things right with Valencia.

• "Angie Tribeca" (7 p.m., TBS): Geils is kidnapped. (Season finale)

• "Scorpion" (8 p.m., CBS/Ch. 2): The team's mission to recover the remains of fallen Marines in Vietnam is threatened by a tornado.

• "Lucifer" (8 p.m., Ch. 13): Lucifer and Chloe try to solve the murder of a prominent restaurateur — and they're suspicious of his son.

• "Jane the Virgin" (8 p.m., CW/Ch. 30): Jane and Michael's wedding plans are side tracked when the Villanueva house is ruined by a flood.

• "NCIS: Los Angeles" (9 p.m., CBS/Ch. 2): The team searches for a North Korean spy.

• "Blindspot" (9 p.m., NBC/Ch. 5): A painting is stolen from an art gallery, and its image is featured on one of Jane's tattoos.

• "The Fosters" (9 p.m., FreeForm): In the Season 3 finale, a tragic loss leads Callie to make a shocking discovery

• "Bates Motel" (10 p.m., A&E): Norman goes on an adventure with a new friend.

• "Recovery Road" (10 p.m., FreeForm): Maddie reaches her 30th day in rehab, but the house loses another membe. (Season finale)

• "The Magicians" (10 p.m., Syfy): Quentin and friends get a crash course in battle magic before to a showdown in Fillory.

• "Damien" (11 p.m, A&E): Damien and Rutledge hinder Shay's investigation.

• "Better Call Saul" (11 p.m., AMC): Mike's hand is forced; Jimmy forges a new path.