Thunderblast appears in the *Transformers: Cybertron* animated series and expanded media as a Decepticon. An ancient arrival on Earth via the Atlantis millions of years ago, she terrorized humans, inspiring myths like Lorelei or the Sirens by luring sailors to their doom with Cybertronian songs. Captured by Autobot Crosswise, she remained imprisoned at Earth's core until Starscream freed her in the present. Her personality blends opportunism, vanity, and a craving for power, sought indirectly by aligning with dominant male Decepticons like Megatron/Galvatron or Starscream. She shifts loyalties based on perceived strength, displaying overt infatuation towards current leaders despite their consistent indifference. She exploits Autobot reluctance to attack females, using flirtatious charm to lower defenses before striking with plasma torpedoes or missile launchers. While manipulative and self-serving, she demonstrates tactical combat awareness, dominating aquatic environments thanks to her speedboat alternate mode. Initially serving Starscream after release, she abandoned him for Megatron upon witnessing his power. During the Omega Lock conflict, Starscream coerced her into betraying Megatron, but she double-crossed Starscream by warning Megatron. Her loyalty remained conditional; when Galvatron gained the Omega Lock's power, she accepted a size upgrade to fight alongside him. However, she fled upon realizing his plan would annihilate her and other Decepticons. She later aided Autobots in stabilizing Jungle Planet's thrusters to prevent Cybertron's destruction. Post-war, she traveled with Ransack, Crumplezone, and a coerced Thundercracker as the "New Decepticon Army." Their rickety rocket crashed on Mars after failing to find acceptance elsewhere. During this time, she repeatedly sought alliances with powerful figures but faced universal rejection. Expanded media explores alternate portrayals. *Autobot Academy* spin-off lore reimagines her as Megatron's advisor from Aquatron, possessing pheromone-control abilities and a contentious relationship with his daughter Artillery. This version married Megatron, adopted a daughter named Armory, and manipulated political connections. Other appearances include a cameo in *Legends* comics within a dream sequence, an interview segment in *The AllSpark Almanac*, and a role in *Spacewarp's Log* stories as a mercenary on Spensifax. Her relationships are superficial. She maintains a genuine, albeit shallow, friendship with fellow ancient Decepticon Lugnutz and despises the human Lori, who orchestrated her defeat on Gigantion using construction cranes. She rejects the infatuated Decepticon Shortround. Physically, she possesses a distinctive feminine design featuring anatomical details uncommon among Transformers at her introduction. Non-canon depictions, like fan creations, re-envision her with triple-changing abilities (boat/jet) and enhanced loyalty to Galvatron.