Roborg is a robot created by Allen, originally for eliminating any intruder, including Four. Four is the ONLY character to return in the reboot, and is in a severely injured state due to all the reboot's characters beating him to near death, and he is the only Four in the show. Impulse is a fighter, athlete, racer, and weather forecaster all in one. She doesn't get effected by interruption, and is aware of everything. Her weakness is Four and slowness.
