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Sierra is a short-lived 1974 television crime drama series focusing on the efforts of National Park Service rangers to enforce federal law and to effect wilderness rescues. The program aired on NBC and was packaged by Jack Webb's Mark VII Limited for Universal Television. John Denver wrote the show's theme song. Robert A. Cinader, executive producer of Mark VII's Emergency!, handled this program also; Bruce Johnson produced.

Michael Warren
Ranger P.J. Lewis

Jack Hogan
Chief Ranger Jack Moore

James G. Richardson
Ranger Tim Cassidy

Ernest Thompson
Ranger Matt Harper

Susan Foster
Ranger Julie Beck

1991

2021

2020

2013

2022

2025

1988

2012

1998

2025
1994

2009

2008

1997

2021

2021

2018

2023

2009

2019