This is a real gem,the iconic partnership of Tom Baker's fourth Doctor and Elisabeth Sladen's Sarah-Jane Smith is in full flow as they get invloved in the sinister going ons on in Zeta Minor.
The late David Maloney was one of the best Who directors,he has been responsible for "The War Games","Genesis of the Daleks" and "The Deadly Assassin",to name a few as well as "Planet Of Evil".
Roger Murray's-Leach's jungle set is great and contributes much to the menacing atmosphere of the story,the decision to shot the jungle scenes,on film,a great idea.
Frederick Jaeger is superb as the tortured,obssessed Professor Sorenson,the scenes as he transforms to the Anti-Matter Creature a hoomage to "Dr Jekyll and My Hyde",indeed other parts of the story very similar to "The Forbidden Planet" movie.
Ewen Solon is a friendly reassuring face as Vishinsky,Space 1999 actor,Prentis Hancock's Salamander is very similar to Vaber,the part he played in "Planet of the Daleks",its a relief when he gets killed.
A great classic from the gothic period of Phillip Hinchliffe's tenure as the producer of Dr Who.