The band's fifth studio album, "The Unforgiving", was released in March 2011 and was one part of a transmedia effort, alongside both a comic book series and a series of short films that together encompass a story. The album saw the band increasingly venturing on new musical territories outside symphonic metal. Their sixth studio album, "Hydra", was released in early 2014 in Japan, Europe, and the United States. The album advanced the band's exploration of new musical genres and features guest appearances from various artists: Finnish singer Tarja Turunen, who appears in the lead single "Paradise (What About Us?)"; Howard Jones, former vocalist of American metalcore band Killswitch Engage; Dave Pirner, lead vocalist of American alternative rock band Soul Asylum; and American rapper Xzibit. The band had extensive airplay on BBC Radio 2 in the United Kingdom with one of the songs from the album, "Whole World Is Watching" featuring Pirner.