Sonisphere’s Sunday night headliner for the Saturn stage has been announced as Dream Theater. The band has been churning out a unique brand of progressive metal for more than 25 years, selling more than six million albums worldwide. They have been inducted into the Long Island Hall of Fame.

As previously announced, The Prodigy, Iron Maiden and Metallica are headlining the festival, with exclusive appearances from Alice in Chains, Deftones and Limp Bizki among the performaces from 100 acts across the weekend, July 4-6.

Also appearing at the festival are Devil You Know, the creative union of the former Killswitch Engage frontman Howard Jones, Francesco Artusato (All Shall Perish), John Sankey (Devolved/ ex Divine Heresy, Fear Factory) and Ryan Wombacher (Bleeding Through). Having voiced the Grammy-nominated Massachusetts metallers through nearly a decade of touring and two gold records, Jones is at the top of his game and the star line up, which has just played Soundwave in Australia, are ready to take on the world.

The band says: “We are beyond stoked to make Sonisphere our first UK festival! It's an honour to be playing such a massive festival alongside some of the biggest names in hard rock and metal. What a way to play the UK for the first time. We can't wait to get over and show everyone what Devil You Know is all about!"

Glasgow heavyweights Yashin will also be stopping by Sonisphere. The band have been working hard, having just released their new video D.E.A.D, with recent live appearances at Warped Tour UK and supports slots with Black Veil Brides, Limp Bizkit and Papa Roach in the UK and Europe. The band’s performance at the festival will be the first chance for fans to see them play tracks from their forthcoming album, The Renegades, scheduled to hit the shelves in September 2014.

Vocalist Harry Radford says:"It’s a huge, huge thrill and a massive honour to be added to this year’s Sonisphere line up. Maiden, Metallica, Limp Bizkit, Deftones… It’s like we've been put in the middle of our record collections, so many of our heroes in one place, it’s actually ridiculous. We're getting back to live action in the next couple of weeks so we will be warmed up nicely to hit the Sonisphere crowd hard. See you there."

Making their way from Nashville, The Cadillac Three will give a dose of their very own country fuzz. The band boasts the kind of loud and boisterous rock that the loudest PA’s in the world were invented for. Tunes such as Down to the River, Get Your Buzz On and Back It Up evoke the legends of southern rock – Molly Hatchets, Outlaws or Ozark Mountain Daredevils, only with a fresher sound that’s going to blow your mind.

Returning to Knebworth are Yorkshire’s Glamour of the Kill, who have just unleashed their infectious new single Freak like Me, taken from their fantastic album Savages. Following a full US tour with Escape The Fate, a European tour with Papa Roach as main support, a largely sold out tour with Motionless In White and The Defiled in the UK, they seem unstoppable as they are about to embark on the Heaven’s Basement’s tour before they promise to treat the festival goers to a full set of their triumphant anthems this summer.

Vocalist Davey Richmond says:“We're really excited to get back to Knebworth for this year’s Sonisphere! There's something special about Sonisphere that you don't seem to get from any other festival and we're happy to see it making a bold comeback. It must be the history associated with Knebworth and all the greats that have stood on stage there throughout the years. The line up for this was already incredible, but it just got a whole lot better.”

Also appearing will be UK based hardcore quintet Palm Reader. Drawing influences from The Dillinger Escape and Gallows, the band would have undoubtedly been winning over new fans on the recent Rock Sound Impericon Exposure tour and show no sign of slowing down before they hit Knebworth.

Drummer Dan Olds says:"We can't wait to play Sonisphere… Bands such as Deftones and Mastodon have always been close to Palm Reader's hearts. It's the first festival I ever went to so it’s gonna be a special moment."

Canterbury’s Broken Hands will bring their particular brand of retro-rock fused with psychedelic blues and garage influences to the stage. Having supported the Rolling Stones in Hyde Park last summer and toured in the UK and Europe with Band of Skulls, Deaf Club and Kill It Kid respectively, they are on the brink of big things.

Mixing an eclectic combination of crushing guitars and infectious electronica, which incorporates elements of metal, hip hop, rock and dance, The One Hundred are going after the hearts and minds of everyone crossing their path and will no doubt expand their ever growing army of supporters after their performance.

Also added to the festival’s line up are Manchester’s Collibus. Having won the 2013 Discretionary Rock Award of Parliament’s largest competition, Rock the House, Collibus made history by becoming the first metal band ever to play the House of Commons. The band’s sound has been described as a combination of the intelligence of prog with the fire of metal, and their winning track Dead Inside has already been featured on SCUZZ TV.

Vocalist Gemma Fox says:“The reception we've had following the release of our debut album has been mind-blowingly phenomenal. We are extremely honoured to have been invited onto the awesome Sonisphere line up and cannot wait to play alongside musicians and bands we have long been fans of ourselves.”