It's happening! After 25 years away from the big screen, the Proton Packs are finally getting dusted off for a new Ghostbusters outing.

However, things are going to be very different now - Bridesmaids and Spy director Paul Feig is behind the camera to launch an all-female led reboot of the series. Here's everything you need to know about the new Ghostbusters...

Ghostbusters cast: Who you gonna call?

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Feig's Bridesmaids stars Kristen Wiig and Melissa McCarthy are expected to be the lead stars of the film, while Saturday Night Live duo Kate McKinnon (she of the fantastic Justin Bieber impression) and Leslie Jones will also be on ghoul-catching duties.

The quartet's impressive comedy chops immediately brings to mind the original 1984 Ghostbusters team, who cut their teeth on SNL.

Remember Annie Potts as sharp-tongued receptionist Janine Melnitz in the original movies? The role has now been gender-flipped with Thor's Chris Hemsworth trading in his hammer for a telephone and keyboard as Kevin. We imagine a star as big as Hemsworth hasn't been hired just to sit behind a desk.

The supporting cast also boasts a pair of Saturday Night Live stars in Neil Casey (who'll be playing the villain) and Cecily Strong in an undisclosed role. Also among the cast are The Wire's Michael K Williams and Andy Garcia.

Ghostbusters trailer: It's nearly here

Paul Feig has promised a trailer by the end of March.

In the mean time, you'll have to satisfy yourself with a ​Ghostbusters​ jumper from the new official site.

Ghostbusters plot: It's a redemption story... sort of

According to the rumour mill, the plot will sail close to the original with Wiig and McCarthy playing a pair of authors who write a flop book about ghosts being real.

Years later, Wiig's character lands a job teaching, but gets laughed out of it when her book resurfaces. When ghosts suddenly materialise she gets a shot at redemption when she teams up with McCarthy, McKinnon and Jones to vanquish them.

Ghostbusters release date: 27 years in the making

Mark down July 22, 2016 in your calendars – this is the cinema release date for the eagerly-awaited film. That's 32 years after the original and 27 after its unfairly-maligned follow-up.

What about the Ray Parker Jr theme song?

Yes, that theme song might be making a comeback in some form. Feig has admitted he's toying with the idea of bringing back the Ray Parker Jr theme.

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"It's such an iconic thing that part of you goes, 'I don't want to change it,'" he told E!. "But then another part of you wants to update it. It's one of the biggest questions we're faced with."

The original Ghostbusters cast will be making cameo appearances​

Though this is a reboot of the story we all know and love, Feig has still welcomed the original cast members into his film with open arms. There are cameos aplenty, with the confirmed line-up as follows...

  • Bill Murray
  • Dany Aykroyd
  • Ernie Hudson
  • Annie Potts
  • Sigourney Weaver

But alas, there's no Rick Moranis, who turned down the chance to return saying it "just makes no sense" for him to come back.

Superstar comedy director Paul Feig is calling the shots

The man behind some of the funniest female-led comedies in recent years - Bridesmaids, The Heat and Spy - is taking over from Ivan Reitman (who remains involved as producer) in the director's chair.

He's also sharing scripting duties with his Heat screenwriter Katie Dippold, who you may have noticed in the supporting cast of Spy.

Paul Feig has some things to say about the negative fan reaction

Big change naturally brings about resistance, and in the case of the new Ghostbusters film, some fans have been vocal online (and downright unpleasant) about jettisoning the previous films.

Feig had this to say to Radio Times on the matter: "It was very rough. The misogynistic ones that were starting to come in were the ones that were the most upsetting.

"I credited the public with being cooler than that. There are so many funny women that aren't getting a chance to showcase who come become big stars."

New York! New York! (in Boston)

New York was an integral part of the original film, with many of the city's great locations playing into the events unfolding. This Ghostbusters will also take place in NY, but the bulk of the shoot will see Boston doubling for the city that never sleeps. Expect plenty of digital trickery and some second unit work to fill in the gaps.

Wiig's character works at Columbia University, the old stomping crowd for Venkman, Stantz and Spengler, so that's another strong tie back to the original.

The series may take a page out of Marvel's playbook

Bill Murray & Sigourney Weaver in Ghostbusters II
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Shared movie universes are in vogue right now, and producer Dan Aykroyd believes Ghostbusters could expand with the kind of ambition that Marvel has shown over the past decade.

"It's beyond just another sequel, a prequel, another TV show. I'm thinking, 'What does the whole brand mean to Sony?'" he explained. "What does Pixar and Star Wars mean to Disney? What does Marvel mean to Fox?" Could the male Ghostbusters film with Channing Tatum be imminent?

The new Ghostbusters have some familiar-looking accessories

Feig and the team behind the new Ghostbusters are keeping close to the 1984 original in terms of design. The costumes (already revealed above) have a familiar feel, Ecto-1's getting retooled with a new Cadillac chassis and Paul Feig has also given us an annotated view of the new proton packs. Take a look at that, and the outfits below!