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 shows up at the last moment to meet Spin in the make-shift boxing ring. He and Spin go at it for three rounds. Spin asks to change bunkhouses.

All the boys except Marty mount up on their Triple R horses. They have a great time chasing a woodchuck on horseback. Ollie observes that Marty is afraid of horses and devises a plan to gently get him accustomed to being around them. He brings the horse Sky Rocket to repair a loose shoe and has Marty pet him. Oliie also reveals that last year Spin was afraid of horses at the start of camp, just like Marty is this year. Eventually, Ollie coaxes Marty into brushing Sky Rocket.

Marty gets in front of the others and shows he can ride. Spin and Mr. Burnett set up a snipe hunt.

Spin and the other returning campers get Marty and the other greenhorns to do silly things in the quest to attract snipes. Perkins brings back a 'snipe' from the hunt.

Burnett realizes Marty has gone riding alone. After Marty gets thrown off, Skyrocket saves him from a rattlesnake. Marty's arm is broken.

Everyone waits to learn if Marty must leave because of his broken arm. Perkins lies to Marty's grandmother so he can stay.

The boys celebrate Marty getting to stay. The boys learn calf-throwing for the rodeo.

Marty has been teaching Skyrocket to do tricks. Perkins wants to learn how to ride a horse. Speck and Russell accidentally cross paths with a bear.

Perkins tells the story of Jags the ghost. Spin takes a dare to sleep in the haunted cabin.

Marty and Ambitious try to scare Spin and buddies by dressing up as Jags. Back at the ranch, the boys start practicing for the rodeo. Spin won't be able to come back to the Triple R if he doesn't win.

The competition goes badly for Triple R when Freddie puts his boots on the wrong feet. Marty and Al help the team come back with their calf roping skills.

Marty pretends his wrist is hurting so Spin can win the points he needs to win another summer at Triple R but Spin doesn't fall for it. Skyrocket's trick helps Marty win the bridling contest.

Triple R wins the rodeo. Spin will get to come back to Triple R for free. Logan tells Spin and Marty they can stay to help with the round-up.