Jonathan Chase is a zoological expert who has learned to mutate himself into various animals. During the war, Ty, Chase's buddy discovers his secret and vows to assist him. In this episode, Jonathan helps Detective Brooke MacKenzie nail a gang of gunrunners.
Bulgarian Zoltan Gregory uses his diplomatic passport to smuggle over and over again costly furs into the US. His partner, the Illusionist Harris, wants to get out. Afterwards Harris is murdered. Professor Chase suspects there is something fishy and begins to inquire.
Policewoman Brooke McKenzie and professor Chase examine the mysterious circumstances surrounding the death of businessman Michael Sloan. Sloan has in his possession a list which might expose American operatives as KGB double agents. What does Terri Sloan know about the list of her father's?
Sarah, the " Wolfgirl from Sultanpur" is taken to New York to be exposed to the public. But she manages to run away. Professor Chase and Brooke try to come behind the secret of Sarah's origin.
A parachutist's failure during a horse race show is used as screen to shift horses. In the form of a falcon Jonathan Chase succeeds in saving the man. A horse breeder uses the bustle to steal a valuable stallion.
The accidental finding of a scrimshaw, a preciously carved walrus's tooth, leads professor Chase, Ty, Brooke and the small Corky on an adventurous treasure search. However, two gangsters want to get rid of Jonathan and his friends.
A ruthless criminal called the "Dragon" terrorizes the businessmen in Chinatown of New York. When an arson attack is committed on the owner of restaurant Tam, professor Chase devises a plan to face the Dragon and his gang.
Jonathan, Ty and Brooke go on a vacation to Birch Hollow but their car breaks down during the journey. They manage to get a lift from a couple who live nearby.
Maggie one of them, asks Jonathan where he had taken Jack. Jonathan realises that she has mistaken him to be part of a gang of robbers who had broken Into her
A gangster's syndicate wants to do a gambling paradise out of the provincial small town Birch Hollow. Jonathan, Brooke and Ty, who have arrived by chance in the crooks' nest, will try to nail the gangsters down. Chase, played by Simon MacCorkindale — love that name, turns himself into a big bear to scare some baddie trying to turn a hotel into a gambling resort.