Virgil, Norman, and Max travel across the world to recruit the help of different heroes to join them in their crusade to destroy the crystal of souls. During this journey, Max starts to become uncertain about his destiny and wonders if he should be the one to lead this group.

Space aliens take over a science station in the arctic and assume the identities of the researchers in order to carry out their devious plan. The aliens can only survive in freezing cold temperatures and they want to make the earth their new home by altering the entire planet's climate by creating another ice age. It is up to Max, Norman, and Virgil to stop them.

Max, Virgil, and Norman travel to Scotland, where there are reported sightings of werewolves. While there, Norman and Virgil are imprisoned and Max meets a man and discovers that he is a werewolf. They do some investigating and learns that a scientist is stealing the blood of natural werewolves to perfect the means of turning herself into an ultimate powerful werewolf. Max outsmarts and defeats her. The man and his pact of werewolves head off into the forest to live in peace.

Skull Master uses the crystal of souls to awaken the former soulless undead inhabitants of the Lost City of Atlantis to retrieve the cosmic cap from Max along with his head. When the underwater zombies arrive on the scene, Norman and Max decide to stand their ground to combat them. Virgil tells them that this is totally pointless and dangerous because the zombies cannot be killed, as they are soulless and already dead. His warnings are ignored, so Virgil decides to take the cap away from Max to save the lives of both the Mighty One and Norman. He travels through the portals to find a place where he could destroy the cap. Max and Norman remember that the cap is indestructible and Virgil already knows that. That Virgil is going to find any futile means to destroy the cap even if it means sacrificing himself in the process. Can Max and Norman get there in time to save their fowl feathered friend?

Max, Virgil, Norman, and a rich Texan go traveling underwater in submarine to battle a a giant octopus that is capturing and destroying ships. While underwater, the group encounters a squid civilization.

Norman struggles with his fear of facing Spike an old adversary of his family who murdered his father when he was a boy escaping from an ice prison. Spike vowed a thousand years to finish off Norman as well, and he intends to keep that promise.

Max's mom brings a figurine back from Haiti that turns out to be filled with zombie parasites.

While on an expedition in the Congo, Max's mom uncovers and is captured by a lost civilization of talking gorillas who enslave human beings. Max with the help of Virgil and Norman set out to rescue his mom and the enslaved humans.

Skull Master tricks a sorcerer by the name of Ravendark who is cursed within a cave to reawaken and release an evil dormant dragon from the earth saying that this will finally give him freedom. What Ravendark doesn't know is that he is not freeing himself by releasing the dragon that will tear the earth apart, but he is freeing Skull Master. Max, Virgil, and Norman fail in preventing the dragon from waking up. Now they must convince Ravendark to put it back to sleep.

While vacationing with his mom in Turkey, Max is accused of stealing a baseball cap and gets the cosmic cap taken away from him and is imprisoned. Norman attempts to free Max from the prison, but they encounter and must do battle against a giant Cyclops. Meanwhile, Virgil and Max's mom search desperately for the missing cap.

When Max brings an ancient necklace back from Egypt and gives it to a girl named Jiffie, it turns out to have a curse that causes her to be kidnapped for sacrifice to a snake god.

Max, Virgil, and Norman must prevent the earth from being invaded by brain sucking space aliens. The only way to do this is for Max to make amends with Ernie, his nerdy loudmouth lab partner from school. Ernie is the only one that can crack the computer codes on the aliens' disks

Eleven-year-old Max receives a baseball cap that turns out to be the key to a series of teleport ""portals"" left by the ancient Lemurians, which as the foretold ""Mighty One"" he must use to defeat the evil Skull Master.