The Who's Pete Townshend performing live on stage.

Photo: Graham Wiltshire/Redferns/Getty Images.

By Nate Millado

When CSI creator Anthony E. Zuiker was searching for a theme song, CBS execs wanted a "rock anthem." So they called the legendary band The Who and showed them the main title sequence scored to "Who Are You," Zuiker revealed in an interview with the Television Academy Foundation. "[Pete] Townshend and [Roger] Daltrey liked it, signed off on it, and it became part of our lore," Zuiker recalls. "And once we did Miami and NY, it was a no-brainer to keep spinning off and doing the same songs from the same band."

CSI: Vegas comes full circle when it premieres Oct. 6 on CBS. Not only are OG cast members Gil Grissom (William Petersen) and Sara Sidle (Jorja Fox) returning, but so is the original theme song. (Joy Oladokun covers the iconic "Who Are You.) A look back at every CSI theme song by The Who!

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CSI: Crime Scene Investigation Theme — "Who Are You"

CSI: Miami Theme — "Won't Get Fooled Again"

CSI: NY Theme — "Baba O'Riley"

CSI: Cyber Theme — "I Can See For Miles"

CSI: Vegas Theme — "Who Are You" (Cover)

Watch CSI: Vegas on Wednesdays at 10 p.m. ET/PT on CBS.

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The stars of CSI: NY

Photo: Timothy White/CBS Photo Archive via Getty Images

By Nate Millado

CSI comes full circle this fall, returning to the city where it all started (Las Vegas) with some familiar faces, Gil Grissom and Sara Sidle. The procedural was a massive hit right out the gate and reinvigorated the crime drama with its cinematic look, fully fleshed-out ensemble, and impressive (for the time) effects. It's no wonder, then, that the mothership has spawned four spinoffs, including the highly anticipated CSI: Vegas. Here's a look back at two decades of CSI.

Watch CSI: Vegas on Wednesdays at 10 p.m. ET/PT on CBS.

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CSI: Crime Scene Investigation (2000-2015)

Marg Helgenberger and William Petersen pose in front of a background of cracked glass

Marg Helgenberger and William Petersen in CSI: Crime Scene Investigation.

Photo: Andrew MacPherson/CBS Photo Archive/Getty Images

Original cast: William Petersen as Gil Grissom, Marg Helgenberger as Catherine Willows, Gary Dourdan as Warrick Brown, George Eads as Nick Stokes, Jorja Fox as Sara Sidle, and Paul Guilfoyle as Jim Brass

What it was about: The Las Vegas PD Criminalistics Division is the #2 crime lab in the U.S—and for good reason! The night-shift team, led by CSI director and entomologist Gil Grissom (Petersen), uses forensic techniques and cutting-edge technology to crack cases that have baffled just about every other crime lab. The rest of the CSI team includes ex-stripper-turned-CSI Catherine Willows (Helgenberger), Vegas native and recovering gambler Warrick Brown (Dourdan), workaholic Sara Sidle (Fox), and empathetic Texan Nick Stokes (Eads).

Stream episodes of CSI: Crime Scene Investigation on Paramount+.

CSI: Miami (2002-2012)

\u200bDavid Caruso as Horatio Caine standing in a field with his badge clipped to his belt

David Caruso starred as Horatio Caine in CSI: Miami, inspired by CSI: Crime Scene Investigation.

Photo: Robert Voets/CBS Photo Archive via Getty Images

Original cast: David Caruso as Horatio Caine, Kim Delaney as Megan Donner, Emily Procter as Calleigh Duquesne, Adam Rodriguez as Eric Delko, Rory Cochrane as Tim "Speed" Speedle, and Khandi Alexander as Alexx Woods

What it was about: We shift from the neon lights of CSI: Crime Scene Investigation to the sun, sand, and swamp of CSI: Miami. The Dade County crew still uses forensic science to catch their criminals, but they also happen to be cops with the power to arrest!

Spun off from: CSI: Crime Scene Investigation. In Season 2, Episode 22 ("Cross Jurisdictions"), a lead on a kidnapped girl in Vegas sends Willows and Brown to Florida, where they meet their Miami counterpart, Horatio Caine (Caruso).

CSI: NY (2004-2013)

\u200bGary Sinise in a gray striped tie and shirt with Melina Kanakaredes in a brown sweater with shoulder cutouts

Gary Sinise and Melina Kanakaredes starred as Detectives Mac Taylor and Stella Bonasera in CSI: NY.

Photo: Art Streiber/CBS Photo Archive via Getty Images

Original cast: Gary Sinise as Mac Taylor, Melina Kanakaredes as Stella Bonasera, Carmine Giovinazzo as Danny Messer, Vanessa Ferlito as Aiden Burn, Hill Harper as Sheldon Hawkes, and Eddie Cahill as Don Flack

What it was about: This gritty installment of the franchise was set on the mean streets of New York. The NYC crime lab team was led by Detective Mac Taylor (Sinise), a former Marine and NYPD veteran who lost his wife on 9/11. Kanakaredes played his partner, Stella Bonasera, a savvy investigator who—being a true New Yorker—often speaks before she thinks.

Spun off from: CSI: Miami. In Season 2, Episode 23 ("MIA/NYC Nonstop"), Caine heads to the Big Apple to fulfill a promise to 16-year-old Laura Spellman, who discovered the bodies of her slain parents. The sunglass-toting CSI from Miami vows to find their killer and joins forces with Taylor (Sinise) and the CSI: NY team, who are investigating a murder that might be related.

CSI: Cyber (2015-2016)

Patricia Arquette on set in a navy suit with a laptop

Emmy and Oscar winner Patricia Arquette headlined CSI: Cyber.

Photo: Monty Brinton/CBS.

Original cast: Patricia Arquette as Avery Ryan, James Van Der Beek as Elijah Mundo, Peter MacNicol as Simon Sifter, Shad Moss as Brody Nelson, Charley Koontz as Daniel Krumitz, and Hayley Kiyoko as Raven Ramirez (Ted Danson reprised his CSI character of D.B. Russell in Season 2.)

What it was about: While previous agents in the CSI franchise tracked down criminals in dark alleyways, CSI: Cyber searched the dark web for anonymous criminals plotting illegal activities behind their keyboards. Inspired by real-life cyber psychologist Mary Aiken, Special Agent Avery Ryan (Patricia Arquette) heads the Cyber Crime Division of the FBI.

Spun off from: CSI: Crime Scene Investigation. In Season 14, Episode 21 ("Kitty"), the CSIs enlist the help of Avery Ryan from Washington, DC, to investigate the cyber-related murder of a prominent casino owner's wife.

CSI: Vegas (2021)

\u200bPaula Newsome and Jorja Fox peer intently at a computer screen in a scene from CSI Vegas

Paula Newsome as Maxine Roby and Jorja Fox as Sara Sidle on CSI: Vegas.

Photo: Sonja Flemming/CBS

Cast: William Peterson as Gil Grissom, Jorja Fox as Sara Sidle, Paula Newsome as Maxine Roby, Matt Lauria as Josh Folsom, Mandeep Dhillon as Allie Rajan, and Mel Rodriguez as Hugo Ramirez

What it's about: CSI opens a new chapter in the city where it all began—Las Vegas. Gil Grissom and Sara Sidle return to the crime lab to investigate a new threat that could potentially release thousands of convicted killers back onto the neon-lit streets of Sin City. They'll enlist a brilliant new team of investigators led by Maxine Roby to follow the evidence in order to preserve and serve justice, deploying the latest forensic techniques.

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Jorja Fox reprises her role as Sara Sidle alongside a new team of crime scene investigators led by Paula Newsome as Maxine Roby in CSI: Vegas.

Photo: Sonja Flemming/CBS

By Nate Millado

When CSI returns to Vegas on CBS, fans will welcome back old favorites, including Gil Grissom (William Petersen) and Sara Sidle (Jorja Fox). But you'll also see some newcomers, led by Maxine Roby (Paula Newsome). Get to know the new team of CSI: Vegas.

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Grissom and Sidle make the perfect team.

Photo: Sonja Flemming/CBS via Getty Images.

By Nate Millado

In forensics, "GSR" refers to gunshot residue, but to CSI: Crime Scene Investigation fans, it's all about the "Grissom Sara Romance." That's why we're so psyched to see that 'ship continue to sail in this fall's highly anticipated reboot, CSI: Vegas, which welcomes the OGs back to Sin City. Watch rounds up some of our favorite GSR moments!

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"Cool Change" (Season 1, Episode 2)

Jorja Fox and William Petersen's characters reunite

Grissom (William Petersen) immediately recognizes Sidle (Jorja Fox) when she speaks.

Photo: YouTube.

Gil Grissom (William Petersen) says he doesn't "even have to turn around" to know who's crashing his dummy test. Sara Sidle (Jorja Fox) joined the CSI team in Episode 2, but clearly these two already shared a past because Grissom was able to ID her simply by the sound of her voice.

"Invisible Evidence" (Season 4, Episode 11)

\u200bGrissom and Sidle reenact a crime scene

Grissom and Sidle reenact a crime scene.

Photo: YouTube.

Sparks fly whenever Sidle recruits Grissom to reenact a crime scene. (Remember this playful exchange from Season 1, Episode 3: "Hey Grissom! Can you help tape me up?" "I love my job," he tells Catherine Willows, played by Marg Helgenberger.) So when Sidle asks Grissom in Season 4 to pin her against the wall to test out a theory, he gladly obliges.

"Nesting Dolls" (Season 5, Episode 13)

Grissom and Sidle have a heart to heart conversation

Sidle can tell Grissom just about anything.

Photo: Michael Yarish/CBS Photo Archive via Getty Images.

Of course GSR was more than just a flirtatious office romance: In this pivotal Season 5 episode, Sidle reveals to Grissom that her mom killed her abusive father, which sent her into foster care.

"Fallen Idols" (Season 7, Episode 17)

Sidle shaves Grissom's beard\u200b

Sidle shaves Grissom's beard.

Photo: YouTube.

In this steamy Season 7 scene, Sidle asks Grissom if he trusts her. "Intimately," he replies. She then proceeds to shave off his beard. Yowza!

"Goodbye and Good Luck" (Season 8, Episode 7)

\u200bSidle kisses Grissom goodbye

Sidle kisses Grissom goodbye.

Photo: YouTube.

Sidle plants a passionate kiss on an unsuspecting Grissom in her Season 8 send-off. Little does he know it will be a kiss goodbye. Later, he reads a letter she left him:

"Gil, you know I love you. I feel I've loved you forever. Lately, I haven't been feeling very well. Truth be told, I'm tired. Out in the desert, under that car that night, I realized something, and I haven't been able to shake it. Since my father died, I've spent almost my entire life with ghosts. We'd been like close friends, and out there in the desert, it occurred to me that it was time for me to bury them. I can't do that here. I'm so sorry.

"No matter how hard I try to fight it off, I'm left with the feeling that ... I have to go. I have no idea where I'm going, but I know I have to do this. If I don't, I'm afraid I'll self-destruct, and worse, you'll be there to see it happen. Be safe. Know that I tried very hard to stay. Know that you are my one and only. I will miss you with every beat of my heart. Our life together was the only home I've ever really had. I wouldn't trade it for anything. I love you. I always will. Goodbye."

"One to Go" (Season 9, Episode 10)

Grissom and Sidle kissing in the jungle

Grissom and Sidle reunite in the jungle

Photo: Sonja Flemming/CBS via Getty Images

In Petersen's CSI swan song (or so we thought), Grissom tracks Sidle down in a Costa Rican jungle as she's photographing monkeys—and seals their reunion with a kiss.

"Immortality" (Series Finale)

Sidle and Grissom embrace on their boat

No words needed: Sidle and Grissom in the series finale.

Photo: YouTube.

In the two-hour series finale, Grissom thanks Lady Heather (Melinda Clarke) for helping him open up to find love. "[Sara] restores my faith in the human being … plus she helps me with my crossword puzzles," he tells her. And before Grissom heads off on his boat, Sidle catches him in the nick of time at the dock. They share a tender embrace, and sail off into the sunset ... together.

CSI: Vegas | "Nightmare in Sin City"

Catch more "Grissom Sara Romance" in the upcoming CSI: Vegas.

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