Gerard Butler insists the sequel to 'Olympus Has Fallen' will be "pretty insane".
The '300' actor - who will reprise his role as secret service agent Mike Banning in 'London Has Fallen' - claims it will be a struggle to make it as good as the original, but is convinced they'll be able to do so.
He told Collider.com: "That ['London Has Fallen'] was one that kind of came out of nowhere. The first one ['Olympus Has Fallen'] was pretty insane and it's the same with this. How do you top that? But that's what we are trying to do right now."
Although Butler, 44, is yet to start filming the movie- which is due out in October next year and also stars Morgan Freeman and Aaron Eckhart - he let slip that the plot will be just as thrilling as the previous instalment.
He said: "It's about a terrorist attack in London and the president is over there because there's a funeral for the British Prime Minister which is part of the plot to get everybody who is anybody to London. Then the s**t hits the fan."
Meanwhile, Butler's latest movie 'How To Train Your Dragon 2' opened in cinemas this week.
The hunky actor - who plays Stoick the Vast in the new animation - recently described making the children's movie as "beautiful exhilarating experience".
Talking on US chat show, 'Late Night with Seth Meyers', he said:"It's good fun making an animated movie. Especially when you do your thing, your voice, then you let it go. It took a while, it was three years in the making, then I'm like an audience member and I turn up and I'm blown away. It's such a beautiful exhilarating experience."

Britain's Prince George watched his first polo match yesterday (15.06.14). The playful 10-month-old prince - clad in a white shirt and pink dungarees - joined his mother Duchess Catherine on the sidelines at the annual Jerudong Trophy Polo Match at th...

Spain's King Juan Carlos and Queen Sofia are likely to keep their titles when they give up the throne. The 76-year-old monarch will step down this week to allow his son Prince Felipe to rule the country with his wife Princess Letizia, and amendments s...

'Emmerdale' actress Natalie Anderson loves the royal family.
The 32-year-old beauty - who plays Alicia Metcalfe on the ITV soap - loves going to the races at Ascot especially when Britain's Queen Elizabeth is present.
She said: "I've been lucky enough to come here a couple of times as some friends of ours have a box in the Royal Enclosure.
"Whenever the queen comes, everyone stands on ceremony and you're allowed to take a few pictures. I was very excited as I love the royals."
Natalie wouldn't let anything come in the way of her seeing the monarch and admits she once caused a small scene when somebody got in her way.
She added to Britain's HELLO! magazine: "So there I was with my camera, when this man darted in front of me. I grabbed him by the shirt and shouted, 'Gerrrrout of the way!' in a really broad Yorkshire accent.
"My husband, James [Shepherd], looked at me as if to say, 'You've just really shown yourself up.' "

Luxembourg's Prince Félix and Princess Claire have become parents for the first time.
The royal couple - who married in September 2013 - welcomed daughter Amalia into the world yesterday (15.06.14), a statement from the prince's parents Grand Duke Henri and Grand Duchess Maria Teresa has announced.
The statement read: "The Grand Duke and Grand Duchess are very happy to announce the birth of the first child of their royal highnesses Prince Félix and Princess Claire.
"The baby was born on 15 June 2014 at the Grand-Duchesse Charlotte Maternity Wing at the Centre Hospitalier de Luxembourg."
Both sets of grandparents are delighted with the new arrival.
The statement read: "The Grand Duke and Grand Duchess as well as Mr and Mrs Lademacher and their families expressed their best wishes and joy at the happy news."
The couple - who live in France - have honoured their mothers, Maria Teresa and Gabriele Lademacher with their little girl's middle names.
The statement continued: "The young princess will bear the names Amalia, Gabriela, Maria Teresa. She weighed 2.95kg and measured 50cm at birth."
Félix was present at the birth and both his wife and daughter are "doing well".
Amalia is Henri and Maria Teresa's third grandchild, as their son Price Louis and his wife Princess Tessy are parents to Gabriel, eight, and six-year-old Noah.

Big Brother: Power Trip's Helen Wood loves her surgically enhanced breasts although she hates the fake look.
The former prostitute - who reportedly had a threesome with football ace Wayne Rooney and hooker pal Jenny Thompson in 2010 - insists her boobs look natural despite having had implants.
She said: "I had my boobs done last September. I absolutely love them."
Asked about what size she is now, she added: "Only a C-cup. I've gone from mosquito bites to infected mosquito bites. I hate the fake look. A lot of people can't tell they're done at all. They're a really natural shape and size. That was the size I wanted. Just so I looked like I'd experienced puberty, which was nice!"
Helen - who has been guaranteed a spot in the 'Big Brother: Power Trip' final after being given a free pass by fellow housemate Pauline Bennett - also has an intense fitness regime which includes doing 100 squats a day to ensure she doesn't have a flat butt.
She confessed to new! magazine: "I've got plenty of time to be exercising [inside the house]. I'm prone to having a flat arse, so I'm going to carry on with my 100 squats a day. Half an hour of excercise a day will keep the fat away, hopefully."

Britain's Prince Harry is going on a "boys only" trip to the Glastonbury festival.
The party-loving prince attended the world-famous music event last year with then-girlfriend Cressida Bonas, and has decided one of the best ways to cure his broken heart over their recent split is to enjoy a break with his friends including Guy Pelly.
A source told the Daily Star newspaper: "Prince Harry had the most amazing time at Glastonbury last year. He managed to spend most of his time mingling with all the other festival goers completely unrecognised.
"He's been personally invited back again this year by festival organiser Michael Eavis and he jumped at the chance."
Soccer-loving Harry will fly back from England's World Cup game against Costa Rica in Brazil and head directly for the festival site.
The source added: "Harry is heartbroken over his split from Cressida. He's done his best to win her back but so far that hasn't worked.
"He's now putting his efforts to enjoying his summer as a single man and the World Cup and Glastonbury are at the very top of his list."
The prince has yet to decide whether to stay in a luxurious Winnebago, check in to nearby hotel Babington House, or be helicoptered in and out of the site.

'EastEnders' are planning a World War I commemorative episode.
Bosses on the BBC One soap are keen to mark the 100-year anniversary of the start of the Great War, and scenes will show Dot Branning (June Brown) organise a special memorial service.
She will be assisted by squaddie Lee Carter, the son of Queen Vic landlords Mick and Linda Carter, in putting together the tribute.
And Lee - who is played by Danny-Boy Hatchard - will also make a heartfelt speech at the service in scenes which will air in August.
A source told The Sun newspaper: "The show felt it was important to mark the centenary.
"It is only right that the heroes should be honoured in the show.
"Dot is the perfect character to bring the appropriate level of reverence while Lee adds relevance from his experiences of conflict.
"It should be a really moving episode that fans will love."
Show producers are keen to keep the episode as accurate as possible, so scriptwriters are being advised by real-life soldiers to ensure military protocols are properly observed.
Meanwhile, the soap will ensure it stays topical tonight (16.06.14) after a last minute scene was inserted to discuss England's World Cup defeat to Italy at the weekend.

Kanye West is working with Rick Rubin on a new album.
The producer, who teamed up with the rapper on his recent LP 'Yeezus', has announced that he has been "looking at vocal ideas" for the 37-year-old star's follow-up collection.
Speaking in an interview with BBC Radio 1's Zane Lowe, which will broadcast today (16.06.14), Rick said: "Kanye West is coming in and we're starting looking at vocal ideas for things for the next album."
Rick, 51, then went on to talk about the time he spent with the 'Bound 2' hitmaker while they were putting together 'Yeezus' last year.
He explained: "He originally came over and said 'I wanna come play you my new album' and I thought we'd be listening to a finished album. Then we listened to about three hours of music, most of which didn't have vocals, and at the end I was like, 'Wow, so what's it gonna be?' I'm thinking it's a year away and he was like, 'Well, I'm putting it out in like 5-6 weeks.' "
He added: "It was just a funny conversation because it was completely normal to him, it's just the way he works."

Rik Mayall's World Cup song has entered the UK singles chart at number seven.
The late comedian's track 'Noble England' - which failed to chart upon its initial release in 2010 - reached the UK top 10 yesterday (15.06.14) following a tribute campaign by fans after his death last week.
More than 300,000 people signed up to a Facebook group designed to get the song to number one and helped it catapult up the chart.
However, 'Noble England' was unable to outperform former 'X Factor' contestant Ella Henderson, whose debut song 'Ghost' hit the number one spot and became the fourth fastest-selling single of 2014 thus far.
Rik, who died at his home on June 9, released 'Noble England' in 2010 to spur on the England football team during the World Cup in South Africa.
He said at the time: "I am the lovechild of Britannia and St George. That is why they gave birth to me, so that I could release this single.
"I'm doing my bit, just like every other Englishman, as we stand shoulder-to-shoulder, doing out bit, stiff upper lip - apart from when you're screaming out the lyrics to 'Noble England'."
A post-mortem conducted on Rik's body last week proved inconclusive, but his wife said he suffered an "acute cardiac event" after his morning run on the day of his death.

Biffy Clyro's next album is "very danceable".
The 'Black Chandelier' hitmakers are using computers to make music for the first time and say their forthcoming seventh album marks a change in direction for the Scottish rockers.
Drummer Ben Johnston said: "It's early days, but a couple of new songs we're recording are sounding very danceable.
"We're thinking of shaking up the way we write - all of us coming up with ideas on our computers and swapping them around. It'll be the first time we've really used computers to write.
"While I'm sure we'll create a few more big rock songs, it'll be good to see what new sounds we conjure up too."
The group - whose last album 'Opposites' topped the UK charts - are ready to "start afresh" with their music and have promised to surprise fans with what they come up with.
Ben told the Daily Star newspaper: "We think of our albums as two different trilogies, and 'Opposites' was number six. It's time to start afresh, and some songs we've worked on are very different.
"Some songs are dark - they sound like black metal."
The 'Many of Horror' rockers headlined the Isle of Wight festival alongside Red Hot Chili Peppers and Kings of Leon at the weekend but didn't think it was the right time to showcase any of their new songs.
Ben explained: "A festival wasn't the place to try out new songs on people who wanted to dance to old favourites."

Cheryl Cole has refused to sit next to Louis Walsh on 'The X Factor'.
The 'Crazy Stupid Love' singer has insisted on being seated away from the Irish music manager - who once looked after her band Girls Aloud - and new judge Mel B will act as a buffer between them on the judging panel when auditions begin in Manchester today (16.06.14).
It's thought Cheryl and Louis are still at odds over his management of her former band and she recently called for him to be replaced on the 'X Factor' panel, despite him being the show's longest-serving judge.
A source told The Sun newspaper: "A lot of thought has gone into the seating after Cheryl said she wouldn't sit next to Louis. The pair have a lot of beef from the days of Girls Aloud.
"It means Mel has to sit between them -- giving Cheryl the key spot next to Simon [Cowell]. Mel is unlikely to be happy about that but, as the new girl, she is just going to have to lump it."
'X Factor' boss and head judge Simon previously revealed he and Cheryl, 30, had disagreed on whether to bring back Louis.
He said: "She doesn't want Louis to come back, but he'll be back. I want him to come back. We work really well together. I couldn't imagine it [without him]."