It Was Only Cause I Knew These Girls Were Funny

Old 'Ghostbusters' Team Up With New Cast on Kimmel: 'These Girls Were Funny' (Video)

Reboot of classic comedy hits theaters on July 15

Who you gonna call? Every Ghostbuster ever, that's who.

The cast from the original movies appeared on "Jimmy Kimmel Live" on Wednesday night alongside the all-female cast from Sony's upcoming reboot.

Kimmel asked Bill Murray, Dan Aykroyd, Ernie Hudson and Annie Potts why they decided to get on board this project after so many attempts to do another "Ghostbusters" film.

Also Read: 'Ghostbusters' Director Paul Feig Told to Expect 'Catfights' Working With Female Leads

"It was only because I knew these girls were funny," Murray said of Kristen Wiig, Melissa McCarthy, Kate McKinnon and Leslie Jones. "I feel like a stepfather to the whole thing, but there is just no quit in these girls."

The original cast all have cameos in the new film, which also stars Chris Hemsworth, Andy Garcia, Michael Kenneth Williams, and Charles Dance.

The "Ghostbusters" reboot will slime its way into theaters on July 15.

Watch the video above.

51 Summer Movies on Our Radar: From 'Captain America: Civil War' to 'Sausage Party' (Photos)

"Captain America: Civil War" (May 6)

The Avengers are back in the third standalone film for "Captain America," in which political pressure to register superheroes with the government divides the team.

Marvel
Getty Images
"Elstree 1976" (May 6)

The documentary features actors and extras from the "Star Wars" franchise as they remember their times on set and talk about how the making of the films affected their lives. Derek Lyons, Anthony Forrest and Laurie Goode all make appearances.
StudioCanal
"Money Monster" (May 13)

Julia Roberts and George Clooney reunite once again in this story about a business network TV host and his producer who face a tough situation when an armed investor seizes their studio.

Tristar
"The Lobster" (May 13)

Single denizens of The City in this film's dystopian future must find a romantic partner within 45 days, or they're transformed into beasts and sent into the Woods. Colin Farrell and Rachel Weisz star.

A24
"Dheepan" (May 13)

After winning the Palme d'Or at the 2015 Cannes Film Festival, the drama will be released in the U.S. by IFC/Sundance Selects. It deals with a former soldier, a young woman and a child who pose as a family to escape the civil war in Sri Lanka.

IFC Films
"Search Party" (May 13)

"Silicon Valley" stars T.J. Miller and Thomas Middleditch reteam alongside Adam Pally in this comedy about two friends who go on a mission to reunite their friend with the woman he was supposed to marry.

Focus World
Universal
Sony/Columbia
"The Nice Guys" (May 20)

Directed by Shane Black, this period detective film starring Russell Crowe and Ryan Gosling will hit theaters in May. In the movie, the two must work together to find a missing girl and solve the seemingly unrelated death of a porn star.

Warner Bros.
"Weiner" (May 20)

The documentary that disgraced New York Congressman Anthony Weiner now regrets granting access, follows his 2013 mayoral bid which ended in a now infamous sexting scandal.

IFC Films/Sundance Selects
"Holy Hell" (May 20)

Twenty years in the making, this documentary goes inside The Buddha Field, a cult formed in the 1980s in West Hollywood, California. Filmmaker Will Allen is a former member of the sect who uses archival footage to tell the story of its charismatic leader, who forced members to perform sex acts, get abortions and undergo plastic surgery, often using hypnotherapy.

FilmRise
Disney
"The Do-Over" (May 27)

Adam Sandler signed a four-picture production with Netflix, and "The Do-Over," costarring David Spade, is his second entry, following last year's "Ridiculous Six." In the film, the two decide to fake their own deaths in order to start over with new identities.

Netflix
Twentieth Century Fox
"Me Before You" (June 3)

Emilia Clarke and Sam Claflin star in the on-screen adaptation of Jojo Moyes' bestselling novel, in which a small town girl becomes the caretaker of a disabled man. Improbably, they fall in love.

Warner Bros.
"The Bye Bye Man" (June 3)

The horror film was most recently moved from October, and follows three college students who move into a house off campus to discover a supernatural entity called the Bye Bye Man. They must save each other while keeping the entity's existence a secret from others. It cleared the date for Ben Affleck's "The Accountant."

STX Entertainment
"The Conjuring 2" (June 10)

The sequel to 2013's "The Conjuring" welcomes back
Vera Farmiga and
Patrick Wilson as they try to help a single mother whose house is plagued by demons.

Warner Bros.
Universal
Lionsgate
"Central Intelligence" (June 17)

The upcoming action comedy stars Kevin Hart and Dwayne Johnson as the unlikely duo teams up for a "top-secret"case.

Warner Bros.
"Finding Dory" (June 17)

The long-awaited sequel to 2003's "Finding Nemo" centers on his blue friend, Dory (Ellen DeGeneres), who goes on a mission to find her long-lost loved ones.

Disney
"Swiss Army Man" (June 17)

Known as the "farting corpse" movie, it stars Paul Dano and Daniel Radcliffe. The film was sold to A24 after premiering at Sundance Film Festival -- before a number of walkouts.

A24
"Free State of Jones" (June 24)

Originally slated for a May 13 release, "Free State of Jones" stars Matthew McConaughey, Keri Russell and Gugu Mbatha-Raw in a film set during the Civil War about a poor farmer from Mississippi who leads a rebel group.

STX Entertainment
"Independence Day: Resurgence" (June 24)

It's been two decades since the first "Independence Day" film, long enough for reinforcements called in by its vanquished alien invaders to mount an even bigger threat. Liam Hemsworth, Maiki Monroe, William Fichtner, Jeff Goldblum and Bill Pullman star.

Fox
"The Shallows" (June 24)

A young surfer (Blake Lively) finds herself stranded on a small rock off shore after she's attacked by a great white shark in this horror movie. She'll spend the majority of it failing to return to land.

Sony/Columbia
"The BFG" (July 1)

The on-screen adaptation of Roald Dahl's famous novel of the same name is finally hitting the big screen, with Oscar-winner Mark Rylance starring as the big friendly giant. Bill Hader, Rebecca Hall and Ruby Barnhill also star.

Disney
"The Legend of Tarzan" (July 1)

We've all seen the stills of Alexander Skarsgard shirtless for this role, so naturally, we're excited to see him play Tarzan alongside Margot Robbie's Jane.

Warner Bros.
"The Purge: Election Year" (July 1)

"The Purge" films have performed consistently well at the box office despite their low budgets. This third installment in the franchise focuses on a presidential contender who vows to eliminate the annual Purge.

Universal
"Captain Fantastic" (July 8)

Starring Viggo Mortensen, Frank Langella and Kathryn Hahn, this Sundance selection chronicles the reintegration into the real world of a man who's raised his kids in isolation for a decade.

Bleecker Street
"Mike & Dave Need Wedding Dates" (July 8)

Anna Kendrick, Zac Efron, Aubrey Plaza and Adam DeVine star in this comedy about two brothers who place an online ad to find wedding dates -- but before they know it, the ad goes viral.

Fox
Universal
Sony
Broad Green Pictures
"Lights Out" (July 22)

A mother tries to save her children from a malicious force of the darkness; the same that haunted her when she was a little girl. Teresa Palmer and Gabriel Bateman star.

Warner Bros.
"Absolutely Fabulous" (July 22)

"Absolutely Fabulous: The Movie" is officially heading to the big screen, based on the cult BBC series that first aired from 1992 to 1995. Starring Jennifer Saunders, Joanna Lumley, Julia Sawalha, June Whitfield and Jane Horrocks, "AbFab" followed Edina Monsoon (Saunders), a heavy-drinking, drug-abusing PR agent who spent her time chasing bizarre fads in a desperate attempt to stay young and "hip."

Fox Searchlight
"Star Trek Beyond" (July 22)

The voyagers of the Starship Enterprise Redux are back, and this time they face a new threat on a planet the Federation has never seen before. Idris Elba joins the returning ensemble cast led by Chris Pine and Zachary Quinto.

Paramount
STX Entertainment
Universal
"Indignation" (July 29)

James Schamus is making his directorial feature film debut with "Indignation," a drama set in 1951 in which a Jewish student struggles with sexual repression at a small Ohio college.

Roadside/Summit
Weinstein Company
"Suicide Squad" (August 5)

One of the most anticipated films of the year pulls together our favorite DC villains like the Joker, Harley Quinn, Deadshot and Boomerang to form a team of supervillains forced to do the government's bidding. The David Ayer-directed film stars Viola Davis, Will Smith, Margot Robbie, Jai Courtney, Adewale Akinnuoye-Agbaje and Jared Leto.

David Ayers Twitter/Warner Bros.
"Ben-Hur" (August 12)

Lew Wallace's classic novel is getting another feature film adaptation, 57 years after William Wyler's Oscar-winning epic. Jack Huston, Morgan Freeman and Toby Kebbell star.

Paramount
"Pete's Dragon" (August 12)

Disney remade the 1977 live action film of the same name, casting Bryce Dallas Howard, Robert Redford, Wes Bentley, and Oakes Fegley as Pete. The film is about an orphaned boy and his best friend, who just happens to be a dragon.

Disney
Sony/Columbia
Sony Pictures Classics
"War Dogs" (August 19)

At the height of the U.S. occupation of Afghanistan, two partying young entrepreneurs land an arms deal with the government worth hundreds of millions. Jonah Hill and Miles Teller star.

Warner Bros.
"Southside with You" (August 19)

A smash hit at this year's Sundance, Richard Tanne's romantic dramedy looks at the first date between Barack and Michelle Obama. Patrick Sawyers and Tika Sumpter star.

Roadside/Miramax
"Don't Breathe" (August 26)

Three teen thieves who steal from the rich decide to go for one last heist at the house of a wealthy, blind war veteran. Just one problem: he can hear them breathing, and he's armed and dangerous. Dylan Minnette, Jane Levy, Daniel Zovatto and Stephen Lang star.

Sony/TriStar
"Hands of Stone" (August 26)

Edgar Ramirez will lace up the gloves to play Roberto Duran, the legendary Panamanian boxer who KO'd Sugar Ray Leonard and became champion in four weight classes. Robert De Niro and Usher also star.

The Weinstein Company