Therapy? will co-headline the Bohemia stage on Sunday and play their Infernal Love album in full.
Frontman Andy Cairns said: "Delighted to have been asked back to Sonisphere. Our Troublegum show in 2010 was a special night indeed and we are very much looking forward to playing our 1995 fan favourite at the UK's premier rock festival."
What a charmer!
But there are more new announcements with the likes of Atari Teenage Riot, Bo Ningen, Trash Talk, Canterbury, LostAlone, Bleed From Within, Dregen, TRC, Breastmilk, Malefice and Glass City Vice making their way to the iconic Hertfordshire venue.
The festival takes place from July 4th to 6th at Knebworth Park and you can find out more - including how to get tickets - at sonisphere.co.uk