The Weatherheads were a group of robots that first appeared in Riding the Storm Out.
The Weatherheads are robotic in appearance and resemble businessmen in white shirts and colored ties. Their heads resemble skulls and they have orange eyes. Shock-O is tall and white, has the thinnest but longest skull, and has an orange tie. Hail-O is short and fat, has the shortest but widest skull, and has a dark blue tie. Gust-O is the middle of the three, and has a light blue tie.
Weatherheads tend to point out that they have no emotions, but it is clear that they are programmed to have them, as shown by an 'on/off' button for their emotions. This can be exploited, as they were tricked by Ben into fighting each other. However, they are all afraid of losing their leader Sunny.
When their emotions are ignited, they each gain much more distinctive personalities. Hail-O becomes moody, cynical, whiny, and depressed, prone to crying fits and talks about the insignificance of everyone in the universe. Shock-O becomes vain and combative, he likes to mock opponents in a condescending and ad hominem way, shown when he called Max's hair out of style, which leads to him running away and crying. Gust-O becomes full of rage, prone to trash talk (he calls Shock-O a "coat rack") and loses his temper and then takes out the target of his frustration, even on his own allies.
The Weatherheads first appeared in Riding the Storm Out, where they attempted to build a weather-manipulating machine in order to create a galactic cyclone. They were defeated by Amalgam Ben, and were sent through the "cosmic cyclone" they created, launching them into space.
The Weatherheads return in The 11th Alien: Part 2, where it is revealed that they were responsible for the unnatural weather that occurred in the previous episode (initially thought to be a consequence of Ben using the Omnitrix), partnering themselves with 'Vilgax. However, once they become convinced that Vilgax will betray them, they decide to turn on him - thus leading to their defeat by Shock Rock.
In The Feels, the Weatherheads, almost completely drained of their battery, try to recharge by creating negative emotions through their use in the weather. While their first attempts to wreak havoc initially work and recharge them (thus making them stronger), they are once again defeated by Shock Rock and quickly run out of charge once again as the happy people rebuild their damage. This subsequently causes the Weatherheads to perform generous acts (under the influence of these positive emotions) and therefore perform poorly and are forced to withdraw.
In Beach Heads, the Weatherheads appear in Tampa Bay, where they try to create their new base. After a fight with Diamondhead, and later Cannonbolt, the Weatherheads begin to get the positive emotions again that they experience while fighting with the latter - this distraction subsequently provides enough time for Gwen and Max Tennyson to destroy their base and thus fail their plans once. more. Thus the episode ends by finally accepting the relaxation and enjoyment they feel on the beach.
In Heat of the Moment, the Weatherheads are quickly defeated by Cannonbolt at the beginning of the episode. It is this embarrassing defeat (as well as countless previous ones) that makes them accept Kevin's advice to accept their emotions, in a last ditch attempt to finally defeat Ben. Later, the now-emotional Weatherheads attack Ben at the ski resort, and use their new emotions to further their own perhaps and quickly defeat Four Arms. However, their downfall comes during their battle with Slapback, where they are convinced (by the latter taking advantage of their emotions) to question their loyalty to Kevin - prompting them to then chase Bashmouth angry instead, and continue to attack Kevin after he transforms. back in human form.
Each of the Weatherheads is capable of manipulating weather-based elements.
Hail-O controls water and ice, allowing him to cause torrents of water to fall from the sky, shoot streams of water from his eyes or hands, and blast shards of ice like a machine gun.
Shock-O controls lightning and electricity, allowing him to release powerful bolts of electricity at enemies, summon storm clouds to rain down lightning, and machinery or extra items that use electricity to make them explode.
Gust-O controls air and wind, allowing him to attack with powerful gusts of air or trap opponents within tornadoes. He can also use it for the purpose of dodging and propulsion, blasting gusts of wind from his palms behind or below him to increase speed.