
At this stage, the Ultra beings must either find a way to recharge or finish the fight as soon as possible, or involuntarily revert to human form, or worse, risk certain death. This is marked by a light on the character's body usually called the Color Timer, or "warning light", which eventually begins to blink with increasing frequency as his energy supply dwindles (and turns from blue to red). The Ultras' main weakness is that they can only stay on Earth in giant form for a limited span of time, usually not longer than three minutes, owing to a limited supply of energy (Earth's atmosphere filters out solar energy).

Ultraman and his many kin are usually red-and-silver (although several color variations have been seen in recent years) and have glowing yellow almond-shaped dome eyes (although there are exceptions to both the shape and color) and various abilities, most notably to fire energy beams from various positions of crossed hands.
