Radhesha, the fourth single from Spark, was unveiled on Wednesday, November 8. The previous singles from the film's album, namely Yema Andham, Idhi Idhi Maya and Gnapakalu, were unveiled over the last few weeks. Radhesha is composed by Hesham Abdul Wahab, with lyrics by Anantha Sriram and vocals by Swetha Mohan. Radhesha details the love and longing Mehreen Pirzada's character feels for the protagonist, played by Vikranth. 

The film is a thriller with elements of romance. Vikranth is seen dating two women, before turning into a murder mystery. 

Spark also stars Rukhsar Dhillon, Guru Somasundaram, Srikanth Iyengar, Annapurna, Raja Ravindra, Satya, Brahmaji, Suhasini, Vennela Kishore, Nasser and Brahmaji. The film's director credits are conspicuously missing. Spark is produced by Leela Reddy under the Deaf Frog Productions banner. AR Ashok Kumar is the film's cinematographer, with editing by Prawin Pudi and production design by S Ram Prasad. The film is written by Vikranth, with dialogues by Umarji Anuradha Mahesh and Thottempudi Swamy.

Spark is scheduled to hit theatres on November 17.