The Revenge Gauge appears alongside the Super Gauge in Street Fighter IV. The Revenge Gauge fills as the fighter takes damage. When the Revenge Gauge is at least 50% full, the player can activate his fighter's Ultra Combo. The more full the Revenge Gauge is when the Ultra Combo is activated, the more damage a successful Ultra Combo will inflict. However, it should be noted that specific characters' Revenge gauge rises quicker than others due to their low health. This includes characters like Akuma and Seth (Seth's health is a little lower than Akuma's so his Revenge Gauge would increase a little faster upon taking damage).