After wreaking havoc, Doombox awoke bound in a brightly lit lab. Feigning inactivity, he listened to his captors' frantic arguments about "subject A1," which had inexplicably merged with a boombox. Oblivious to their panic, Doombox shattered his chains and obliterated the glass surrounding him. A viscous substance dripped from a canister marked B1, leading to a memory blackout. During an intense Lethal League match with Sonata, Doombox reverted to his Boombox form, releasing a mysterious entity. As it lunged, Sonata's vision blurred and faded. Upon regaining consciousness, she felt the rhythm of her boomhammer pulsate through her veins—this wasn’t so bad.

• The Stereo Overdrive Arachnida Colorway: A striking red and black outfit complemented by visualizer leggings.
• The Midnight Tinnitus Colorway: A tan ensemble paired with vibrant purple visualizer leggings.
• The Gigahertz Visualizer X Colorway: A bold red and black combination featuring visualizer arms.
• The Gigahertz Visualizer Z Colorway: A mesmerizing purple and magenta outfit equipped with visualizer arms.