| Assistant Cameraman | Karl Kitt |
| Assistant Editor | Tikki Goldberg, Barbara Kress, Andrea Scharf |
| Associate Producer | Dick Plautz, Jack Willoughby |
| Boom Man | Ron Everett |
| Cast | Steve Brodie (as Dr. Vance), Barbara Hale (as Dr. Jenny Langer), Robert Easton (as Kester), Leslie Parrish (as Ev), Alan Hale Jr. (as Sheriff), Bill Williams (as Dutch), Kevin Brodie (as Perkins), Diane Lee Hart, Tain Bodkin (as Preacher), Paul Bentzen (as Billy), J. Stewart Taylor (as Deputy), Christiane Schmidtmer (as Helga), William W. Gillett Jr. (as Rider), David B. Hoff (as Helicopter Pilot (voice)), Joel Thingvall (as Gas Pump Kid (uncredited)) |
| Composer: Stock Music | William Loose (as (uncredited)), Jack K. Tillar (as (uncredited)) |
| Continuity | Barbara Kress |
| Courtesy Of: Enstrom Helicopter | Enstrom Helicopter |
| Courtesy: Vehicles | American Motors Co. |
| Director | Bill Rebane |
| Director Of Photography | Jack Willoughby |
| Distributor | Group 1 International Distribution (as (1975) (USA) (theatrical)), Astral Films (as (1976) (Canada) (theatrical)), Inter Record Cinematografica (as (1976) (Italy) (theatrical)), Joy Pack Film (as (1976) (Japan) (theatrical)), Sédimo (as (1976) (France) (theatrical)), Toei Yoga (as (1976) (Japan) (theatrical) (In Association With)), AB Europa Film (as (1977) (Sweden) (theatrical)), Hemdale Film Distribution (as (1977) (UK) (theatrical)), American Broadcasting Company (ABC) (as (1978) (USA) (TV) (network television)), Turner Classic Movies (TCM) (as (2009) (USA) (TV) (cable television)) |
| Executive Producer | William W. Gillett Jr., Mark L. Rosen |
| Film Editor | Barbara Pokras |
| First Assistant Director | Kevin Brodie |
| Gaffer | Alan M. Rebane |
| Grip | Buck Gillett, Carl Pfantz, Dick Plautz |
| Hairdresser | Sue Brodie |
| Key Grip | Dick Plautz |
| Make-up Artist | Tom Schwartz |
| Music Editor | John H. Arrufat, Bill Rebane |
| Post-Production Sound Services | Ryder Sound Services |
| Producer | Richard L. Huff, Bill Rebane |
| Production Company | Cinema Group 75 |
| Production Company (Copyright Holder) | Transcentury Productions |
| Production Secretary | Joann McCracken, Pat Phillips |
| Script | Barbara Kress |
| Second Assistant Director | Barbara J. Rebane |
| Set Decoration | Jutta Rebane |
| Set Designer | Bill Rebane |
| Sound Effects Editor | James Bryan |
| Sound Mixer | Steve Hunter (2) |
| Special Effects | Richard Albain, Robert Millay |
| Stunt Man | Robert F. Nelson, Dennis Wilder |
| The Producers Wish To Acknowledge The Cooperation Of | Lincoln County, Wisconsin, Marathon County Sheriff's Department, Nicolett College and Technical Institute, Owens of Illinois, Town of Gleason, Wisconsin, Town of Merrill, Wisconsin, University of Wisconsin |
| Title & Optical Effects | Consolidated Film Industries (CFI) |
| Unit Manager | Barbara J. Rebane |
| Wardrobe | Robin Brodie |
| Writer (Original Story) | Richard L. Huff |
| Writer (Screenplay) | Richard L. Huff, Robert Easton |
| Links | https://www.imdb.com/title/tt0073043/?ref_=nv_sr_srsg_0 |
