Stargate: Atlantis: Season 2, Episode 13

Critical Mass (20 Jan. 2006)

TV Episode  |  TV-PG  |   |  Action, Drama, Sci-Fi
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Ratings: 7.8/10 from 425 users  
Reviews: 2 user

The Trust, a Goa'uld terrorist organization, has planted a bomb in Atlantis.



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Title: Critical Mass (20 Jan 2006)

Critical Mass (20 Jan 2006) on IMDb 7.8/10

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Episode cast overview, first billed only:


McKay discovers two Wraith cruisers in the vicinity of Atlantis, but it seems they are not heading to the city. In fact he thinks they are firing on each other. Soon Atlantis faces a bigger problem. Meanwhile on Earth, Stargate finds out the Goa'uld have infiltrated in the highest ranks of The Trust, a terrorist organization. They have a planted a bomb in Atlantis, set to go off the next time a gate is established between Earth and the Pegasus galaxy. As the Atlanteans are preparing a status update to be sent on short notice, time is of the essence. It's impossible to send them a message through the gate, the Daedalus is in between the two worlds, but they are too far away to relay the message. Written by Arnoud Tiele (

Plot Summary | Plot Synopsis

Plot Keywords:

babe scientist | See All (1) »



Release Date:

20 January 2006 (USA)  »

Company Credits

Production Co:

Show detailed on  »

Technical Specs


Sound Mix:

(Dolby 5.1)| (5.1 surround)


Aspect Ratio:

16:9 HD
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Did You Know?


Rachel Luttrell did her own singing in this episode. See more »


When Dr. Lee is speaking about relaying a transmission to Atlantis he incorrectly draws the Stargate symbol for Earth on the left most part of the white board and identifies it as Atlantis. See more »


Dr. Rodney McKay: Elizabeth is including intel about infighting amongst the Wraith in today's status report.
Lt. Colonel John Sheppard: Let's hope that trend continues. If they keep fighting like this, I'd be able to take a weekend off.
See more »


References 101 Dalmatians (1996) See more »


Beyond the Night
Performed by Rachel Luttrell
Composed by Joel Goldsmith
See more »

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User Reviews

Good episode; some plot holes
22 August 2012 | by See all my reviews

This episode is one of my favourites. A combination mystery / action plot, the story kept me on the edge of my seat throughout and had a nice twist at the end. In terms of plot, the danger that Atlantis faces escalates smoothly from a contained threat to a wholly uncontained and terribly threatening one. The ending has a beautifully unexpected twist, the implications of which are unfortunately not fleshed out in later episodes.

In spite of the tension, the writers also work in some good humour (using Zelenka and Lee). A few episodic characters are brought back, including Kavanaugh (who turns in a consistently realistic performance as the annoying, self-absorbed civilian with authority issues). The characters, especially Weir, are willing to own up to and consider the ethical dilemmas raised by their actions, a refreshing step in light of some of the episodes at the beginning of Season 3. And there's a lot of McKay in this episode (Confession time: McKay is my favourite character. Probably I'm one of the few people who is happy to see a lot of him in any given episode.)

Weak points: Teyla's emotional, poorly-considered decision will annoy some viewers who should see a much more obvious solution to the problem.

Still, good episode: Nice plot, nice characters, better-than-average treatment of ethical problems. Enjoy!

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