| Tom Baker | ... | Doctor Who | |
| Elisabeth Sladen | ... | Sarah Jane Smith | |
| Frederick Jaeger | ... | Sorenson | |
| Ewen Solon | ... | Vishinsky | |
| Prentis Hancock | ... | Salamar | |
| Graham Weston | ... | De Haan | |
| Louis Mahoney | ... | Ponti | |
| Michael Wisher | ... | Morelli | |
| Terence Brook | ... | Braun | |
| Tony McEwan | ... | Baldwin | |
| Haydn Wood | ... | O'Hara | |
| rest of cast listed alphabetically: | |||
| Max Faulkner | ... | Crew Member (uncredited) | |
| Julian Hudson | ... | Morestran (uncredited) | |
| Mike Lee Lane | ... | Antimatter Monster (uncredited) | |
| David Rolfe | ... | Crew Member (uncredited) | |
| Terry Walsh | ... | Crew Member (uncredited) | |
| Episode Crew |
Directed by | |||
| David Maloney | |||
Writing credits | ||
| Louis Marks | (by) | |
Produced by | |||
| Philip Hinchcliffe | .... | producer | |
Original Music by | |||
| Dudley Simpson | |||
Film Editing by | |||
| M.A.C. Adams | (as Mike Adams) | ||
Production Design by | |||
| Roger Murray-Leach | |||
Costume Design by | |||
| Andrew Rose | |||
Makeup Department | |||
| Jenny Shircore | .... | makeup | |
Production Management | |||
| Janet Radenkovic | .... | unit production manager | |
Sound Department | |||
| Peter Howell | .... | special sound | |
| Colin March | .... | film sound | |
| Tony Millier | .... | sound: studio | |
Visual Effects by | |||
| Dave Havard | .... | visual effects designer | |
| Bernard Lodge | .... | title sequence | |
Camera and Electrical Department | |||
| Brian Clemett | .... | studio lighting | |
| Kenneth MacMillan | .... | film cameraman | |
| Stanley Speel | .... | film cameraman (as Stan Speel) | |
Music Department | |||
| Ron Grainer | .... | composer: title music | |
Other crew | |||
| Robert Holmes | .... | script editor | |
| Malachy Shaw Jones | .... | production assistant | |
| Series Crew These people are regular crew members. Were they in this episode? |
Writing credits | ||
| Sydney Newman | (creator) uncredited | |
Production Design by | |||
| Bob Cove | (1970s) | ||
| Victor Meredith | |||
| Michael Trevor | |||
Makeup Department | |||
| Dorka Nieradzik | .... | makeup designer (1982, 1984-1988) | |
Art Department | |||
| Peter Brachaki | .... | production designer: TARDIS interior | |
Special Effects by | |||
| Mat Irvine | .... | special effects (1970s-1980s) | |
| Ian Scoones | .... | special effects (1960s-1980s) | |
| Ron Thornton | .... | special effects (1980s) | |
| Bernard Wilkie | .... | special effects (1960s-1970s) | |
Visual Effects by | |||
| Mitch Mitchell | .... | special video effects (1960's-1970's) (as A. J. Mitchell) | |
| Bernard Lodge | .... | title sequence designer (1963-1979) (uncredited 1963-1969) | |
Stunts | |||
| Alan Chuntz | .... | stunts (1960's-1970's) | |
| Peter Diamond | .... | stunts (1960s) | |
| Max Faulkner | .... | stunts (1960's-1970's) | |
| Stuart Fell | .... | stunts (1970s-1980s) | |
| Alf Joint | .... | stunts (1960s-1980s) | |
| Derek Martin | .... | stunts (1960s-1970s) | |
| Roy Scammell | .... | stunts (1960s-1980s) | |
| Lee Sheward | .... | stunt coordinator | |
| Terry Walsh | .... | stunts (1960s-1970s) | |
| Derek Ware | .... | stunts (1960s-1970s) | |
Camera and Electrical Department | |||
| Stewart A. Farnell | .... | camera operator (1 episode) | |
| Peter Hamilton | .... | camera operator (12 episodes) | |
| Alan Jonas | .... | camera operator (6 episodes) | |
| Ken Westbury | .... | camera operator (4 episodes) | |
Music Department | |||
| Paddy Kingsland | .... | composer: incidental music (1980-1985) | |
| Keff McCulloch | .... | composer: incidental music (1987-1989) | |
| Humphrey Searle | .... | composer: incidental music (1965) | |
| Dudley Simpson | .... | composer: incidental music (1964-1980) | |
Other crew | |||
| Christopher Baker | .... | production assistant | |
| Ali Bongo | .... | magic advisor | |
| Kenneth J. Bussanmas | .... | creative consultant (1979-1985) | |
| Jeremy Hare | .... | assistant floor manager (three episodes) | |
| Main series | Episode guide | Full cast and crew |
| External reviews | IMDb TV section | IMDb Adventure section |
| IMDb UK section |
With Tom Baker as the Doctor & Elisabeth Sladen playing Sarah Jane Smith this period had both the most popular Doctor and the most popular companion in the shows history. This period also had Producer Phillip Hinchcliffe & Story Editor Robert Holmes who would bring to the series some of its most popular serials in their relatively short tenures.
Aboard the Tardis the Doctor and Sarah Jane receive a distress signal from the planet Zeta Minor at the edge of the known universe. The arrival of the Tardis coincides with the arrival of a military mission sent to check on the success of the scientific expedition which was trying to find a new power source. While the power source may solve the energy crisis that prompted the mission the expedition members are dying mysteriously.
The jungle set from Production Designer Roger Murray-Leach is incredibly effective considering this is an inexpensive studio bound serial. One of the flaws most often mentioned about classic Doctor Who is the often cheap and sometimes wobbly sets, and while not all the sets in this serial are great the jungle stands out. Unfortunately the BBC system meant that designers rotated in and out from series to series and not all of the designers were as motivated or as capable but Roger Murray-Leach's serials usually stand out.