No one is as happy as Bill Murray dancing to the 'Ghostbusters' theme song

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Dan Aykroyd Gushes Over Leslie Jones & New 'Ghostbusters' Cast: They're 'Brilliant Stars'

It's clear who ya gonna call for a good time! On Wednesday night, Jimmy Kimmel Live gave Ghostbusters fans a real treat when the original cast of the 1984 film – Bill Murray, Dan Aykroyd, Ernie Hudson, and Annie Potts -- and the new all-female cast of the upcoming revival – Kristen Wiig, Melissa McCarthy, Leslie Jones, and Kate McKinnon -- joined forces to talk about the upcoming movie.

The OG GB's hit the stage dancing to – what else? – the iconic Ghostbusters theme song, which was played by a live band headed up by original singer Ray Parker Jr.

New & Original Ghostbusters Dance to Their Theme Song

WATCH: EXCLUSIVE: Dan Aykroyd Says the Original 'Ghostbusters' Cast 'Respect the Talent' of the All-Female Revival Stars

But comedy legend Murray took it a step further, literally leaping for joy as the song played. He grabbed SNL alum Wiig and together the pair jumped up and down like two head bangers at a rock concert. Murray didn't let his infectious enthusiasm stop there. He managed to wrangle in McCarthy and McKinnon to continue the dance session at the other stars also boogied around the stage.

Later in the evening the two casts had a joint interview in which the original stars couldn't stop gushing about the remake.

"It was only because I knew these girls were funny," Murray said of why he agreed to join this reboot. "They just, there is no quit in these girls. This is a tough movie to pull off because it's a big concept, there's a lot on the plate, there's a lot of expectation."

The seasoned funnyman wasn't afraid to be candid about his reaction to the film, saying, "When you see the film -- and you'll delight in the film -- it sort of rumbles along in the beginning. And you're going, 'Oh, God, are they going to pull this thing off?'"

via GIPHY

MORE: The Original and New 'Ghostbusters' Casts Unite for One Epic Selfie -- Check It Out!

Thankfully, the ladies did manage to meet Murray's expectations. The original cast saw the film for the first time this week, and Murray said, "[We] were screaming, cheering like we were at a sporting event."

ET caught up with the cast earlier in the week at the Elle Women in Comedy event where Aykroyd had nothing but kind words for the next generation of ghost-fighting comedians.

"We respect the talent so much that for me, [it's] thrilling," he told ET's Cameron Mathison.

Ghostbusters hits theaters July 15.

Check out more "Ghostbusters" love in the gallery below!

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The all-female Ghostbusters cast
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No one is as happy as Bill Murray dancing to the 'Ghostbusters' theme song
BOSTON, MA - JUNE 18: Kristen Wiig is seen on the set of 'Ghostbuster' in Boston on June 18, 2015 in Boston, Massachusetts. (Photo by Stickman/Bauer-Griffin/GC Images)
SANTA MONICA, CA - FEBRUARY 21: Actress Kristen Wiig speaks onstage during the 2015 Film Independent Spirit Awards at Santa Monica Beach on February 21, 2015 in Santa Monica, California. (Photo by Kevork Djansezian/Getty Images)
US actress Melissa McCarthy poses for photographs on the carpet as she arrives to attend the European premiere of the film 'Spy' in London on May 21, 2015. AFP PHOTO / NIKLAS HALLE'N (Photo credit should read NIKLAS HALLE'N/AFP/Getty Images)
NEW YORK, NY - JUNE 01: Actress Melissa McCarthy speaks during SiriusXM's 'Town Hall' With Melissa McCarthy, Jason Statham And Paul Feig at the SiriusXM Studios on June 1, 2015 in New York City. (Photo by Astrid Stawiarz/Getty Images for SiriusXM)
NEW YORK, NY - FEBRUARY 23: Samantha Yanks, Cecily Strong, Leslie Jones and Debra Halpert attend the Gotham & Hamptons Magazines celebration of Gotham's Spring Issue featuring Saturday Night Live's Cover Stars at Four Seasons Hotel on February 23, 2015 in New York City. (Photo by Eugene Gologursky/Getty Images for Gotham Magazine)
LATE NIGHT WITH SETH MEYERS -- Episode 205 -- Pictured: Leslie Jones, SNL cast member, during an interview on May 12, 2015 -- (Photo by: Lloyd Bishop/NBC/NBCU Photo Bank via Getty Images)
NEW YORK, NY - APRIL 15: Actress Kate McKinnon attends Opening Night: Live From New York! during the 2015 Tribeca Film Festival at the Beacon Theatre on April 15, 2015 in New York City. (Photo by Jamie McCarthy/Getty Images for the 2015 Tribeca Film Festival)
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