Cyclonus is an extremely loyal and efficient Seeker in the Decepticon army and Megatron. His chilling voice speaks of the destruction that they will rain down on their enemies, and he delights in his cruelty. He can combine with his fellow Decepticons Cyberwarp, Skyjack, Treadshock, and Riotgear to form Galvatronus, he's got the muscle to back up his mouth. He serves as the main antagonist of the third and final season of Transformers: Robots in Disguise.
While the Decepticons were training on the streets of Iacon, they received a message issuing a challenge from Cyclonus. Cyclonus met a small group of Decepticons atop a building, announcing he was going to "bring them back to reality". They proceeded to battle until Cyclonus was soundly defeated and agreed to join the Decepticon cause.
He was subsequently part of the mission in which the Decepticons kidnapped Swoop for their Dark Energon experiments. As the Autobots tried to retrieve their friend, Cyclonus confronted them. Standing behind a force field, he unleashed his "minions" — some swarms and a few turrets — to attack the Autobots. When those fell and his forcefield was disabled, Cyclonus was reduced to a cowardly wreck, promising to open the door to the laboratory if they didn't hurt him. Once the Autobots had retrieved Swoop, Cyclonus revealed he'd rigged the lab to blow and sped off in his jet mode, activating more force fields to keep the Autobots from following him.
Following the restoration of Cybertron, a new High Council came to rule the planet. Cyclonus and his troops easily usurped the Council however and used Light Benders to conceal their true identities so as to assume control of the planet. As revealed in Freedom Fighters, they also put into motion plans to make Steeljaw into their errand boy and Soundwave into their ally so as to usher a new Cybertronian age.
As for Steeljaw and his pack, Cyclonus and the rest of the Council broke him out of imprisonment to torment the Autobots on Earth as a distraction. Exiles For Soundwave, they genetically reprogrammed a small group of Mini-Cons to bring him three Decepticon Hunters to free him from the Shadowzone and reformat him; they also gave him the directive to summon back Megatron to lead their conquest of Cybertron.
In Enemy of My Enemy, as their plans were reaching fruition, Cyberwarp asked why aliens had to suffer for Cybertron's ascension to which Cyclonus responded that they didn't have to suffer. It was just a happy bonus before he told her to play her part and make a broadcast.
In Freedom Fighters, when Cyberwarp hesitated in making her broadcast, Cyclonus took over and finished it before shooting down her concerns about morality and ordering Skyjack to activate the Space Bridge to Earth. The Bee Team infiltrated the Council chambers however and destroyed the Light Bender to which Cyclonus ordered an attack over Cyberwarp's protests. When fighting the Autobots one-on-one failed, Cyclonus ordered his troops to combine into Galvatronus. Cyberwarp's reservations however allowed Ultra Bee to defeat them, separating them back into their individual robot modes.
- Cyclonus's War for Cybertron design was created by illustrator David White.