As the opposing forces commence battle, an unexpected battalion descends on the tower library. Meanwhile, to stop Dr. van Sangfreud's meganimal transformation, Blister and Muck put their friendship to an unthinkable test.

Muck's schemes skew the results of Dr. van Sangfreud's mind-zapping experiment. Meanwhile, Blister embraces his inner villain.

Blister discovers a secret weapon in the junk castle library. Orville and Bartie make some unexpected alliances. Meanwhile, Dr. van Sangfreud loses control of the monstrous meganimal hounds.  

In a bid to rescue Muck, Spindle, and Rip, Blister's crew faces unexpected obstacles. Meanwhile, Dr. van Sangfreud's meganimal serum induces monstrous side-effects.

The plan to recruit reinforcements fumbles on all fronts. Only Orville Whitmore has successfully enlisted helpers to defeat Dr. van Sangfreud. Will this ragtag crew suffice?

Determine to topple Dr. van Sangfreud once and for all, Blister sets out to recruit bloodthirsty wharf rats to his ragtag battalion. Can he reveal the one secret that would secure their allegiance before they gobble him up?

Blister labors to keep Scab and Bile committed to rescuing Muck, Rip, and Spindle. At the same time, he enlists help from zoo director Orville Whitmore and singing elephant Gorgeous George.