HALO: TAS focuses on the lives of a group of tween superhumans attempting to establish themselves as proven superheroes as they deal with normal adolescent issues in their personal lives.
The pilot episode aired a month prior to the debut of the regular series and introduced three characters: Sai, Proteus and Aeria. They discover that a covert operation is going on under their school and must try to discover what's happening before anyone gets hurt. In the end they discover that dangerous portals are being opened to the Seventh Dimension, and so they must negotiate with Guardian to organize a covert operations team. After consulting with his wife, Guardian establishes HALO in a Jett, funded by Wilson Industries. Here the tweens are trained and mentored by Guardian and Archangel I.
|"Underground Part 1"|
When the heroes realise that something strange is happening in Woodsworth Middle School, they investigate and find a mysterious mirror...
|"Underground Part 2"|
As they chase the mysterious figure through the mirror, they come out in Shadehaven and must defeat Terrai and Mixie.
|"We are HALO!"|
They finally establish themselves as HALO, Heroic Angelic VigiLant Organization, with the help of Sai's father, The Guardian.
As they pursue Blu, he leaves them a set of clues which do nothing but throw them off the trail.
|"Are-Ris Part 1"|
Miss Eden brings Hannibal to Soloris. And Maelstrom is revealed to be cloning HALO.
|"Are-Ris Part 2"|
|HALO is replaced by Hell Anarchy and EVil Organization, and the heroes must break out of Maelstrom's dungeon to rescue Soloris City! When they escape, they work together to take down HAVO.|
|"Hannibal the Animal"|
Hannibal has been mutated and is consumed by Bloo who is revealed to want revenge on Blu as more of his tragic story is revealed...
Nightwatcher in a flash of light defeats a group of the elite Star Gang who is secretly being controlled by an unknown leader. As he investigates the real HALO offer him the embassador of HALO in the nation and city of Shadehaven.
|"Greetings from The Seventh Dimension"|
Victor Starr is seen flying into a portal in the pre-theme song scene, and it is revealed that the Maelstrom is his cousin and they plan to rule Soloris with an iron fist!
IC: Victor Starr
|"Battle for Planet Soloris"|
|Kang comes back to the 21st century to eliminate Captain America - even over the Avengers' dead bodies!|
|"The King of The Seventh Dimension"|
|Kang cries HAVOC and lets loose his dogs of war as his forces begin a worldwide invasion|
|"The Dimensional Dynasty"|
|The Avengers attack Kang's flagship in hopes of stopping the invasion of Earth!|
|"The Assault on Iciclus"|
|On the hottest day of the year, an ancient artifact is found... then a cold wind blows. An ancient relic called the Casket of Ancient Winters has been opened, and the entire planet goes into a deep freeze!|
|"Hail the King"|
|HYDRA and A.I.M. are waging war against one another, and only one person knows why... the Black Widow. The Avengers will now have to work with the "double agent" of S.H.I.E.L.D..|
|"Alpha Jett Part 1"|
|Ant-Man has had enough of the violence and wants to find a better way to bring peace to the world... after all, that's why he created Ultron. But something has gone terribly wrong.|
|"Alpha Jett Part 2"|
|As the devastated team struggles with a loss, Ant-Man and Iron Man go about destroying all remnants of Ultron. But they don't realise that Ultron has transcended his body, and has infiltrated the world's computer systems...|