After returning from a first contact mission, Janeway, Neelix and the Doctor must retake Voyager from an infestation of microorganisms that grow to an alarming size.



(based upon "Star Trek" created by), (created by) | 3 more credits »

Watch Now

With Prime Video



Episode cast overview:
Lieutenant B'Elanna Torres (as Roxann Biggs-Dawson)
Tak Tak
Michael Fiske ...
Garan Miner


When Janeway and Neelix return to Voyager they find the crew barely alive having been invaded by a microscopic life form which is growing to macroscopic proportions. Written by laird-3

Plot Summary | Add Synopsis

Plot Keywords:

24th century | See All (1) »

Parents Guide:




Release Date:

11 December 1996 (USA)  »

Company Credits

Production Co:

Show detailed on  »

Technical Specs


Sound Mix:


Aspect Ratio:

1.33 : 1
See  »

Did You Know?


47 reference: after beaming down to the Garan mining colony, the Doctor proceeds on vector 1-4-7. See more »


First appearance of the new designed phaser rifles. Problem is, how did they get them since they are lost in the Delta Quadrant? They didn't get the new designed uniforms because of their predicament. They kept the DS9 style uniforms throughout the entire series. See more »


[first lines]
Tak Tak: Good health, strong body, clear mind.
Neelix: And you - your hospitality, your generosity, your patience - many thanks.
See more »


References Star Trek: The Next Generation: Genesis (1994) See more »


Star Trek: Voyager - Main Title
Written by Jerry Goldsmith
Performed by Jay Chattaway
See more »

Frequently Asked Questions

This FAQ is empty. Add the first question.

User Reviews

I thought Voyager's mission was to eventually make it home?!
18 February 2015 | by (Bradenton, Florida) – See all my reviews

I read through another review of this episode and I really had to agree. If Voyager is lost in the Delta Quadrant and they are trying to get back home, WHY do they keep taking all these unnecessary side trips? And, why do they keep going off on rescue missions when they are in need of rescue themselves?! Here in "Macrocosm" the Captain and Neelix are off on some unneeded diplomatic mission and the ship goes off on a rescue mission that, not surprisingly, just about destroys the ship! The end result--the ship gets infected with some weird virus that assumes HUGE sizes and is awfully difficult to destroy.

So what's to like about this one? Well, there is a lot of slime and we do get to see Janeway actually killing something and acting tough (both are VERY rare). Otherwise, the show just doesn't make a lot of sense AND the aliens they negotiate with are among the most annoying in Trek history. Not terrible but certainly far from good.

4 of 18 people found this review helpful.  Was this review helpful to you?

Message Boards

Recent Posts
Why is it considered "bad star trek" daremes84
Am I the only one that liked Voyager better than DS9? glenn1199
Species the Borg probably can't assimilate JohnSmith2560
Why is Tuvok so uninspiring or uncharismatic compared to Spock? osprey1987
Watching from beginning again - The Doctor is clearly the best character dethnoble
Least likable alien species Zyschqual
Discuss Macrocosm (1996) on the IMDb message boards »

Contribute to This Page

Create a character page for: