A band of intrepid adventures sets out to learn the secrets of the Invizimals, invisible creatures who live all around us in a parallel existence.
New recruit Hiro has a hard time adjusting to the Alliance. But when he has to face an X-Tractor invasion, he gets the Invizimal Tigershark's help.
After the Z1s barely make it out alive from a botched mission to the Inviziworld, Keni discovers that Tigershark has come back to Earth with him.
Tigershark tells the Z1s that the Invizimals need Hiro's help: The X-Tractors have taken over a sacred site that must be recaptured.
While investigating an energy source in an Inviziworld desert, the Z1 discovers a subterranean temple guarded by an Invizimal named Überjackal.
When an X-Tractor squad breaks into the Temple of Light, Überjackal refuses help from the kids. Lima hatches a plan to find Tigershark.
As Überjackal and Tigershark fight, the X-Tractors surround the temple. A wounded Überjackal escapes deeper into the temple with the staff of Anubis.
When Otomo is zapped into the Alliance HQ, Hiro convinces him it's part of a virtual game. Now he wants to face the X-Tractors in the Invizimal world!
Hiro has a date, but he has to exchange appearances with an Invizimal during a mission, so Sam goes on the date disguised as Hiro.
The Z1s go to Mexico to investigate strange stories about 'El Gran Mendoza,' an unbeaten wrestler whose superstrength could be Invizimal-related.
A surprise party for Sam goes wrong when Hiro, Lima and Tigershark get stuck and the 3-meter-high Invizimal can't operate his stealth system.
Scores of Terracotta Warrior statues are missing. The unit tracks them to Invizimal Xiaong Mao, who plans to reanimate them to defeat the X-Tractors.
Lima reverts back to her teenage self when she comes in contact with a strange Invizimal and becomes obsessed with gossip, clothes and Dustin Viva.
Sam considers leaving the Alliance and taking an internship with mysterious philanthropist Mr. Black, unaware that he's behind the X-Tractors.
Hiro, Lima and Sam are following Toxitoad’s trail when they discover a gooey substance of unknown origin. Hiro will have to overcome his childhood traumas to help Roboquito, the patient zero of a new and disgusting disease that could endanger the whole Invizimal world.
The Z1 Unit is ambushed in the Atlantis Kingdom and Hiro ends up blowing up the whole universe as a result! However, he goes back in time and discovers that no one remembers what happened. That fragment of the mysterious Invizimal meteorite surely has something to do with it. Will Hiro be able to save the day or will he be doomed to repeat it forever?
Draco is in danger! This Invizimal’s crystals are so powerful that they have been hidden in a statue at Park Güell, in Barcelona. Without his crystals, Draco has no chance against the XTractors soldiers. The Z1 unit must go to help him, and, also, to help Lima with her weird habit of accumulating useless souvenirs from around the world.
