Imagine Dragons and producer Alex Da Kid collaborated on the song "Radioactive." It is one of the darker and more electronic-influenced tunes on Night Visions, akin to the fourth track "Demons." The song is an electronic rock and alternative rock song with dubstep undertones. It was written by Daniel Meddings and Justin Tranter along with Jared Leto and Ben McKee, who are all members of the band Thirty Seconds to Mars. Leto had said in an interview that he and McKee wrote the song before they formed Thirty Seconds to Mars and were looking for musicians to collaborate with. They had contacted several people but no one else came up with a good idea so they went with what they had instead. Leto also said in the same interview that he thinks the song is funny and it makes him feel like a nuclear scientist when listening to it. It was released as a single on June 24, 2013. The music video for the song was directed by David Malinowski and premiered on July 7, 2013. It shows Leto playing various characters in a dark room while they each say a line from Shakespeare's Hamlet. As the song progresses, these characters begin to act out their emotions through dance and drama. At the end, it is revealed that all of them are actually Leto, who has been using this method to deal with his grief over losing his wife.