
Mike is called away to Soda Springs to help with an outbreak of influenza and Sully promises to stay with the children. Sully plays ""Mr. Mom"" but the kids grow restless. While out exploring caves with Brian, Sully is shot trying to intervene between the Indians and the cavalry. When the smoke clears, Brian can't locate Sully and goes to town for help. The Reverend helps the kids hide Sully, who now has a bounty on his head. They take Sully to the cave for safety. Colleen enlists the Reverend's help to bring supplies from the clinic, but he is spotted by Hank and Jake, who are out for the bounty. They knock Hank out and tie him up, but when Colleen is forced to remove the bullet, she must employ Jake's assistance to save Sully's life. When finally they ride back into town, the Cavalry tries to arrest Sully for blowing up the railroad, but the townsfolk provide Sully with an alibi preventing his arrest.
After Snowbird gives Mike an Indian pony, Flash, in thanks for her work at the reservation Mike tries to enter the Territory Stakes Race, but race officials, Loren and Jake, won't allow a woman to ride. Dr. Cassidy arrives from Denver with his champion horse and spurns Mike attempts to speak to him colleague to colleague. Dr. Cassidy's rider, Drew, is injured and Mike diagnoses cranial compression, yet Dr. Cassidy refuses Mike's assistance. Drew dies and an angry Mike is determined to enter the race, disguised as a man. Meanwhile, with encouragement from Grace, Brian enters a pie-baking contest and is met with skepticism from Colleen and Loren. To everyone's surprise, Brian is declared the winner. Mike rides the race of her life and wins, but is disqualified when her disguise is revealed and Hank, riding Dr. Cassidy's horse, is declared the winner.