The Mad Scientist Monster on Season 13 of The Masked Singer was revealed to be Brian Kelley, the Grammy-nominated country music superstar from the duo Florida Georgia Line. He placed fourth in the competition and was known for his powerful performances and distinctive clues referencing his Florida roots and music career. For example, his costume featured symbols like oranges and peaches representing Florida and Georgia, and a tarpon necklace symbolizing his love for fishing and the outdoors. His performances included songs like "Unwell" by Matchbox Twenty and "Stay" by Sugarland. The judges and fans had guessed various country artists, but the final reveal confirmed it was Brian Kelley