Radioactive

The Las Vegas rock band Imagine Dragons open their debut album, Night Visions, with this track on the subject of embracing change. Dan Reynolds sings about the realization that the world is becoming different and breaking free by doing something new. The song was released as the band's second single on February 14, 2012, the same day "It's Time" was released.

Uses of the song in media include it being played in the trailers for the video game Assassin's Creed III and the film The Host. The tune also soundtracked the spot promoting the first season of the NBC drama series Chicago Fire.

Regarding the album title, Night Visions, Dan Reynolds explained to Tenementtv.com that it was inspired by the twilight hours, the band's favorite time. "When the title came up in conversation, we just knew it was right," he said. "We always write between 3 am and 6 am, that's when we write best. That's the only time we write actually. Our guitarist is a clinical insomniac; he sends me stuff that he's written after being up for five days straight. A lot of that guitar made its way to the album. After dark, my lyrics are born. A lot of lyrics I have written have come from dreams and of course nightmares."