Rotatatron (ビッグボーイ Biggu Bōi?, lit. "Big Boy"), also known as the "Big Boy" by Doctor Eggman, is a giant robot and the boss of Tropical Resort in the Wii version of Sonic Colors. On Planet Wisp, this boss is shown to have an upgraded counterpart, Refreshinator.
After Sonic discovers Eggman is capturing Wisps for his own evil deeds, Eggman unleashes Rotatatron to stop Sonic, but the boss is ultimately demolished. When destroyed, a part of Rotatatron's arm becomes lodged in a part of Dr. Eggman's Incredible Interstellar Amusement Park; and in the end of the story, the arm causes Eggman's giant mind control cannon to backfire.
This boss fight is rather simple, as he only takes three hits to defeat, and attacks by clamping his hands on the circular arena. The weak point of the giant contraption is its large yellow eye located at the center off its body, which can be hit by a Homing Attack, when the eye is fully open. The player will need to jump onto the moving platforms to get closer to the eye. One platform has a capsule containing a Cyan Wisp which can be used to attack either his eye or his arms to deal double damage. If the Cyan Laser attacks Rotatatron's arms, then the laser runs through the arms like an electric current and strikes the eye. After the eye is hit three times by a Homing Attack or a Cyan Laser, the robot is destroyed, showering Sonic with Rings, and then the player is ranked. Throughout the fight, Rotatatron will launch red energy discs at Sonic.
Mario & Sonic at the Sochi 2014 Olympic Winter Games
Rotatatron appears once more as a boss in Sonic's Figure Skating Spectacular, a Dream Event in Mario & Sonic at the Sochi 2014 Olympic Winter Games. In this battle, each of the four characters participating in the event must near the deadly robot and carefully time a jump in order to hit its eye. This cycle repeats, except this time, Rotatatron shoots red shurikens at the player(s). After the next four hits have been dealt, the four characters skate out into the center of the rink. Once in position, the player(s) must spin in order to perform the Final Color Blaster and deal Rotatatron the final blow.
- Rotatatron is the name of the boss according to the Sonic Colors Prima Guide and the Sonic Colors Original Soundtrack - "ViViD SOUND X HiBRiD COLORS". In-game, however, Eggman calls it the "Big Boy", probably in reference to its Japanese name.
- Despite being replaced with Globotron in the Nintendo DS version of Sonic Colors, Rotatatron makes a cameo in the second Act of Tropical Resort on the Nintendo DS version as the ferris wheel that chases Sonic towards the end of the Act.
- The music that plays during the battle against Rotatatron uses a portion of the music that plays when fighting Egg Wizard in Sonic Rush Adventure.