ON DANGEROUS GROUND / SILENT RUNNING (FULL MOVIE) 1986

Plot: Harvard educated Dr. David Lowell's (Collins) research is carried out in the canyon country of southern Utah and must be conducted at the same time Halley's Comet is passing over the earth. Lowell is trying to find a safe, cheap energy source using the sound waves the comet generates.

Lowell leased the land from the Pilgrim Corporation. However, the Pilgrim Corporation decides the same canyon would be better used as a remote place to illegally dump nuclear waste. Pilgrim's CEO (Nicholas Pryor) arranges for Lowell to be thrown off his land and destroys his laboratory.

Lowell spends the rest of the film committing sabotage against the company and trying to recover his land, assisted by the daughter of Pilgrim's CEO (Janet Julian) as well as unlikely help from a hit-man sympathetic to Lowell's cause (Bo Svenson). Brook Alistair (Lance Henriksen), hired by the Pilgrim Corporation, attempts to stop Lowell.

Choke Canyon (titled On Dangerous Ground outside the United States) is a 1986 film, starring Stephen Collins as a "cowboy scientist" trying to develop an alternative energy source. It was filmed mostly in the vicinity of Moab, Utah.