An old enemy of Skullmaster awakes in the depths of the underworld, and Max finally faces his destiny and returns to Skull Mountain to destroy Skullmaster once and for all.
Caught in the middle of the storm of battle between Lava Lord and Skullmaster, Max and his friends are forced to escape through the underworld portal, though their escape comes at a terrible price.
Free at last, Skullmaster immediately begins his evil work by fooling an island tribe into drinking dragon's blood, which transforms them into monsters that only obey him. Max and co arrive to try and save the last of them.
In the strange town of Schlepak, something weird is gobbling up the townspeople. Max and his friends go there to try and find the cause of disappearances.
Max is summoned to China to stop the evil Lao Chu, resurrected Emperor of the Rats, who threatens to engulf the world with the numberless hordes of vermin at his command.
Max, Virgil, Norman, and Max's pet iguana Thor journey to a mysterious island to stop the menace of a mad doctor who has invented a way to "de-evolve" modern animals back into dinosaurs.
When a spiteful computer nerd becomes near-omnipotent after transforming himself into a living computer virus, only Max's gaming skills combined with Virgil's knowledge of mathematics can save the day.
When giant spiders begin preying on Seattle, it's up to Max alone to stop the danger posed by a demented mutant because spiders happen to be Norman's only fear.
During the felling of trees, loggers accidentally release the bloodthirsty Lockyar, an undying evil spirit of violence who has the power to incite rage and madness in all those who fight him.
Talon, a wicked, ancient soul-devouring entity from the Astral Plane is unleashed and Max Virgil and Norman must find a way to trap him in the bizarre dimension he came from before it's too late.
In Los Angeles, an ancient, super-powered Sabretooth is disturbed from it's rest by construction workers and only a similarly powered caveman, with Max's help, can stop it.
Max must rescue Virgil, Norman, and a group of children from the deranged Freako, a man whose deformities make him look just like a clown, who has enslaved and transformed them into hideous mutants to be slaves in his dark circus.
Virgil summons Max to inform him that he may not be the real Cap Bearer, and that they may have found the real Mighty One. Virgil devises a test to decide who is the real chosen one, a test that proves to be disastrous for the world.
Cyberskull re-emerges from the depths of cyberspace to enact revenge by manipulating a brainwashed cult into transferring his essence into a gigantic robot body which will grant him unimaginable power once again.
A vampire is loose in London and it's up to Max and co to stop her. However, they find that this particular bloodsucker is anything but the classic vampires of legend.
The menace of the now super-intelligent mutant Dr Zygote returns and this time his vast mind powers are focused on discovering the key to ultimate evolution.
Max and the guardians travel to the center of longitude and latitude to stop Skullmaster's lackey, Warmonger who betrays his master, from destroying the balance of nature. But is there a grander scheme at work?
In order to live for another 10,000 years, Nornan must survive the trial of the Conqueror, a mighty beast-warrior who he must battle from dawn to dusk or he will cease to exist.
A race of strange bird-like aliens arrive on earth to steal something that they consider precious. Knowing what they aliens want is actually toxic waste, Max may just be able to kill two birds with one stone.
A mysterious ring is delivered to Max's mom which possesses her hand and draws her toward the goddess Isis, who means to use her as a sacrifice to resurrect her husband Osiris.
Max and his friends must stop a madman who believes he still lives in the 50's from bringing about a nuclear winter while fighting off the deadly giant scorpions that he commands.
Skullmaster reforges the Crystal of Souls and launches an all-out assault against Max and the guardians, hunting them relentlessly across the globe for the Cap, which is the key to a ritual that will make him all-powerful.
Max and co travel to France to investigate why cargo ships are disappearing. When they discover who is behind it, everything they ever knew about classic science-fiction books is blown away.
It is the day of the Winter Solstice. With Norman and Virgil both destroyed, Max faces the evil of Skullmaster for the last time alone. However, things are about to come full-circle in a way that no one could have ever fathomed.
