6.7/103 votes#1 - The Invisible Enemy (3)
Season 15 Episode 7 - Aired 10/15/1977
Miniaturised clones of the Doctor and Leela are injected into his brain. But they must now fight the virus on its own level. And its servants are closing in around them.
Director: Derrick Goodwin
Writer: Bob Baker
6.7/103 votes#2 - The Invisible Enemy (4)
Season 15 Episode 8 - Aired 10/22/1977
The Nucleus, now grown to human size, is determined to spawn and take over the Galaxy. Only the Doctor and Leela can stop it.
Director: Derrick Goodwin
Writer: Bob Baker
6.3/104 votes#3 - The Invisible Enemy (1)
Season 15 Episode 5 - Aired 10/1/1977
Deep space, 5000AD. An Earth supply shuttle is infected by a strange sentient space-borne virus, which quickly spreads to the crew of the refuelling station on the moon Titan. Even worse, the Doctor himself falls victim. But why is Leela immune, and what is the virus's ultimate goal?
Director: Derrick Goodwin
Writer: Bob Baker
6.3/104 votes#4 - The Invisible Enemy (2)
Season 15 Episode 6 - Aired 10/8/1977
Leela and Lowe take the Doctor to the Bi-Al Foundation for help. But how can they cure an infection of the mind?
Director: Derrick Goodwin
Writer: Bob Baker
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Derrick Goodwin Ratings Summary
"The Invisible Enemy (3)" is the best rated episode directed by Derrick Goodwin. It scored 6.667/10 based on 3 votes. It was written by Bob Baker. It aired on 10/15/1977 and is rated 0.0 points higher than their second-best episode, "The Invisible Enemy (4)".