Marty gives and overall introduction to the series showing clips from episodes. Spin joins Marty at the end of the introduction to invite viewers to watch the show "starting next week."

Ollie, head wrangler for the Triple R Ranch, herds the riding stock from the range into the corral where the boys arriving for summer camp can see them. Spin, a highly competent camper from last summer, jumps from the fence onto the bare back of his horse from last year, Sailor. Bill Burnett, the camp counselor, reprimands him. Freddy is a glasses-wearing tenderfoot whose parents are very protective. Speck has a penchant for pets of all sorts. Last to arrive is Martin Markham, the spoiled grandson of a rich grandmother who has raised him after his parents died. He has even brought his butler Perkins who will stay at the camp with him helping out in the kitchen.

Martin is aloof, dressed in a suit and way too proper for the other campers. He greets them with, "How do you do, gentlemen?" He is more than happy to let Mr. Burnett carry his luggage to the bunk house and wonders why he can't have a private room. He winces when Burnett calls him Marty, not Martin. When Bill asks Marty about what sports he likes, he replies no to all of them. He does have a collection of books about horses that he brought along, although he admits to having never been on a horse. The other boys feel a bit sorry when they learn he has no parents. Camp director Logan tell Burnett that Marty's dad was one of his military officer pals who was killed in action during WWII.

Marty is fascinated by the horse at Triple R Ranch. He leaves a gate open and the white stallion corners him. At dinner, not wanting to seem too bookish, he says his hobby is playing polo.

Spin plants a frog under the covers of Marty's bed. He is so angry that the Counselor sets up a boxing match between the two.