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Hail is robotic in appearance and resembles a bulky businessmen with white shirt and dark blue colored tie. His head resembles a skull and he has orange eyes.
Just like the other Weatherheads, Hail-O has a tendency to remark that he has no emotions, yet it is clear that he is programmed to have them, as seen with a 'on/off' button for his emotions. This can be exploited, as he was tricked by Ben into fighting with the other Weatherheads. However, they all fear failing their leader Sunny.
When his emotions are turned on, Hail-O becomes moody, cynical, whiny, and depressed, prone to crying fits and talking about everyone's insignificance in the universe.
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Hail-O first appeared alongside the other Weatherheads in Riding the Storm Out, where he appears in his human form in Pikes Peak with his companions Gust-O and Shock-O. Here, Hail-O states with Gust-O that he is already impatient, even if he has no emotions. Hail-O and his companions press the button on his suit to change into robot form and immediately start causing a severe storm at the scene.
Hail-O starts creating water curtains to scare off campers and says he'd be pleased if he had emotions, but he doesn't. Hail-O continues to make curtains of water until all the campers evacuate until he sees Grey Arms arrive, but he is easily defeated by Shock-O.
Hail-O says that thanks to that alien, he affected the order of the plan factors a bit, Shock-O mentions that a normal person would panic, but Gust-O ends by saying that it is time to launch phase two. Hail-O creates rain that begins to affect all of Pikes Peak.
Hail-O and his companions combine the technology of their suitcases to create a great weather tower, Gust-O looks at it in awe and mentions that they will soon heed his call and thus begin the true mission. Hail-O starts laughing and says that he would laugh like that if he felt emotions, but of course he doesn't.
Ben arrives with his cousin to get the attention of the Weather, Ben tells them to go for a walk, Hail-O does not understand the joke and says they don't have time for that, Gust-O explains that they will extinguish the mammals there.
The three Weatherbots move their ties and press a button to activate the tower and it creates a huge tornado that begins to grow as the seconds pass. The Tennysons managed to escape after a Hail-O attack and the robots watch as they leave, but they immediately make the tornado follow them until they are caught in its orbit.
Hail-O and his teammates jump into the tornado and prepare to face Amalgam Ben, he tells a joke and everyone starts laughing while Hail-O says he can't understand the jokes but they make him laugh. Amalgam Ben tries to hit Hail-O and companions multiple times but fails in all attempts.
Amalgam Ben watches as the tornado grows into space and Gust-O tells him that he has already seen too much, Hail-O mentions that he would feel angry, but since he is a Weatherbot, he does not feel emotions. Ben Amalgama tells them to do the best they can and asks them what their problem with emotions is, Hail-O responds by saying that emotions are inefficient and weak.
Shock-O attacks Amalgam Ben but he reflects the lightning with his Taydenite arm and makes the affected one Hail-O. While he was away, Hail-O sees how Gust-O attacks Shock-O by mistake and calls his attention and tells him to concentrate, Gust-O replies that the only one who should concentrate is him. Shock-O scolds Hail-O but Hail-O responds by saying that the one who wanted to start phase two fast as a baby was Shock-O.
Ben Amalgama takes the opportunity to get to the weather tower and tell the robots that they are annoying, Hail-O and his companions respond by saying that they are not annoying and get enraged, so the three Climate Changers combine their attacks to create a powerful lightning bolt. of wind, water and lightning.
The attack is aimed at Amalgam Ben, but he moves in time and the attack hits the weather tower, causing it to begin to collapse. The Weathermen freak out, and Hail-O says he didn't see that coming. The collapse of the tower causes a cyclone that begins to suck everything and Hail-O tells Ben that he has not heard the last of the Weathermen until he is completely consumed by the cyclone and disappears.
In Beach Heads, the Weatherheads are seen at Tampa beach, where they attempt to charge their solar battery. After a fight with Diamondhead, and later Cannonbolt, Hail-O begins to take in the positive emotions once more that they experience whilst battling the latter - this distraction subsequently providing enough time for Gwen and Max Tennyson to destroy the solar battery and thus foiling their plans once more. The episode ends with Hail-O finally accepting the relaxation and enjoyment that they feel on the beach.
Powers and Abilities
Hail-O controls water and ice, allowing him to cause torrents of water to fall from the sky, unleash streams of water from his eyes or hands, and fire shards of ice like a machine gun.
Hail-O's denial of his own emotions can easily be exploited by the Weatherheads' enemies.
In the event that the Weatherheads perform acts that generate positive emotions, Hail-O will malfunction and shut down.
Being a robot, his battery can run low. In order to recharge, he needs solar energy.
- Riding the Storm Out (first appearance)
- Hail-O is the only Weatherhead to retain his voice actor throughout all of his appearances in subsequent episodes.