Paul Walker plays Phil Deedle, one of the laid-back surfer brothers who are mistaken for park rangers and sent to Yellowstone National Park.
John Ashton portrays Capt. Douglas Pine, the no-nonsense head of the Junior Rangers program who mistakes the Deedle brothers for park rangers.
Dennis Hopper plays Frank Slater, the eccentric ex-park ranger who has a history with Capt. Pine and the Deedle brothers.
Eric Braeden portrays Elton Deedle, the father of Phil and Stew Deedle, who sends them to work at Yellowstone National Park.
Richard Lineback plays Crabbe, a park ranger at Yellowstone National Park who becomes suspicious of the Deedle brothers.
Robert Englund portrays Nemo, the quirky survivalist who helps the Deedle brothers navigate Yellowstone National Park.
M.C. Gainey plays Major Flower, the military veteran who assists Capt. Pine in tracking down the vandals in Yellowstone National Park.
Steve Van Wormer portrays Stew Deedle, the laid-back surfer brother who embarks on the adventure to Yellowstone National Park with Phil.
A.J. Langer plays Lt. Jesse Ryan, the tough and resourceful park ranger who helps the Deedle brothers in their mission to save Yellowstone National Park.
Ana Gasteyer portrays Mel, the no-nonsense park ranger who is initially skeptical of the Deedle brothers' abilities.
Megan Cavanagh plays Mo, the friendly and enthusiastic park ranger who befriends the Deedle brothers during their time at Yellowstone National Park.
Hattie Winston portrays Jo-Claire, the caring and experienced park ranger who helps guide the Deedle brothers through their mission at Yellowstone National Park.
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