A chimp's life is threatened by townspeople when they think it's infected with bubonic plague.
An entertainer, Duke Felix Otway, has convinced all the children to come to his show, leaving the circus without an audience.
Ben and Tony are caught in the middle when they have to deal with a centuries-long feud between the McNeills and the McDuffs.
Casey's former commander sends his son Earl to the circus and asks Casey to toughen up his son. Casey has his work cut out for him dealing with Earl, a mild-mannered scholar.
Ben runs afoul of the attractive Naomi Champagne when he helps foil a stagecoach robbery and is convinced to replace the dead driver.
Casey ends up taking care of two Japanese orphans, Yuki and Hideko, who are talented acrobats.
Tony discovers that the circus' next stop, Paradise, doesn't have enough meat to feed the circus and its animals.
Katy Cogswell believes that lighter-than-air travel is the coming thing, and is willing to risk her life to prove it.
Ben and Tony discover that the mining town of Purgatory has been turned into a slave labor camp... and they're "recruited" to work.
Colonel Thompson tries to buy an elephant, Hannibal, from its owner, Bertha Beecher. However, she won't let it go until Thompson pays in full.
Ben helps Toby Mills, a timid man beset by a bully, but ends up with more than he anticipated when Toby applies to join the circus.