Stargate: Atlantis (2004–2009)
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Critical Mass 

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


Andy Mikita


Brad Wright (created by), Robert C. Cooper (created by) | 3 more credits »

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Episode cast overview, first billed only:
Joe Flanigan ... Lt. Col. John Sheppard
Torri Higginson ... Dr. Elizabeth Weir
Rachel Luttrell ... Teyla Emmagan
Jason Momoa ... Ronon Dex
Paul McGillion ... Dr. Carson Beckett
David Hewlett ... Dr. Rodney McKay
Beau Bridges ... Maj. Gen. Hank Landry
Jaime Ray Newman ... Lt. Laura Cadman
Ellie Harvie ... Dr. Lindsey Novak
Ben Cotton ... Dr. Kavanagh
David Nykl ... Dr. Radek Zelenka
Bill Dow ... Dr. Bill Lee
Peter Flemming Peter Flemming ... Agent Malcolm Barrett
Gary Jones ... Chief Master Sgt. Walter Harriman
Mitch Pileggi ... Col. Steven Caldwell


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) »


TV-PG | See all certifications »



USA | Canada



Release Date:

20 January 2006 (USA) See more »

Company Credits

Show more on IMDbPro »

Technical Specs


Sound Mix:

Dolby Digital (Dolby 5.1)| DTS (5.1 surround)



Aspect Ratio:

16:9 HD
See full technical specs »

Did You Know?


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


When the Atlantis gate begins dialing Earth automatically the symbol for Earth is not seen on the gate's chevrons. See more »


Dr. Bill Lee: What about the Daedelus? It's on a return voyage to the Milky Way. We could use them to relay the trans... ah no, wait... no way they're close enough, even with their long range transmitters.
Major General Hank Landry: You'll find another way to get the message to them.
Dr. Bill Lee: I will?
Major General Hank Landry: Of course you will. It's what I pay you for.
See more »


References Stargate SG-1 (1997) 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 mkvonbergenSee 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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