“Trio” is the sixteenth episode of the fourth season of Stargate Atlantis.

Doctors Jennifer Keller and Rodney McKay report their findings of M5V-801 to Colonels Samantha Carter and John Sheppard. The planet has been suffering from tremors for several generations, and experience around four tremors a day, as the settlement is built over seismically unstable ground.

Also, it was a mining planet. Twenty years ago, the Genii came and forced all the inhabitants as miners for their own personal gain. However, after the Genii got the resources they needed, they abandoned the planet. Because of this, and the unsafe air quality, an abnormally high number of inhabitants are suffering from respiratory problems. They organise a mission to evacuate the settlement into another part of the continent, but in order to do so, the inhabitants have a list of demands a “mile and a half long”.

Carter arranges for her, Keller and McKay to the planet. An hour later, they arrive and are walking to the settlement, when McKay steps through a very weak, hollow part of the ground, which causes a hole in the ground, where McKay falls through it. Carter and Keller, lay on the ground to spread their body weight, and sees McKay at the bottom, hurt, but alive. However, as the women plan to dial the Stargate for help, the hole gets bigger, and they fall through also.

The trio find themselves in the abandoned Genii mining facility. Upon further investigation, they see a massive door, presumably the main entrance and exit. McKay notice a panel of Genii numerals, which requires a code to open the door. However, since they don’t know the code, they move on to the next sealed door, painted red, which most likely means the door was sealed for a reason. Their suspicions turn out to be correct, when they notice a very high drop down the chasm on the other end.

With nothing much more to do, they decide to just sit and wait for rescue to arrive, since if they don’t report to Atlantis, they’ll soon send help if anything goes awry. However, as they sit and wait, they experience a tremor, and notice the facility is starting to give way, since they facility is only supported by metal stilts, which are starting to give way, since the three people and the earth is putting on more weight for the complex to support. With this information, help may came too late, so they plan to escape. They notice a load of crates around. Their plan, is to stack the crates into a pyramid-like fashion. Meanwhile, in order to reduce weight, Keller removes the earth to down the chasm.

With the crate-pyramid, Carter starts going up the crates, since both McKay and Keller are both afraid of heights. However, as Carter approaches the top, the wood starts to crack below her and give way. However, so close to escape, Carter continues to reach the beams to the hole and climb up, but before she is able to do so, the crates shatter, and Carter slams into the ground on her stomach. Since that plan didn’t work, they have to think up a new plan.

Soon, McKay finds something to double up as a grappling hook. However, since they couldn’t find rope, McKay estimates since the hole is 20 to 25 feet high, and thinks that if they strap jackets, shirts and pants together, it could create a rope long enough. He tells them to strip, and Keller starts doing so, until Carter conveniently found rope. Keller then pulls her shirt down and replaces her jacket, while an obvious look of disappointment comes across McKay’s face. Carter notices the rope is too thin for them to grab onto, so she and Keller starts tying it. McKay reads through Genii files, hoping the files could contain the codes to unlock the door. Meanwhile, the women play “who would you rather”. There, McKay overhears the name Neil deGrasse Tyson, where he claims he once stole an idea from him. He is then forced to play the game with them.

Suddenly, they hear the noise of children playing in the field. Together, they all scream for their help. The children notice, and are just curious why the trio are down their. The trio ask them for their help. However, they say they can’t, because if their parents finds out that they are helping strangers in an area they’re not supposed to play in, they’ll all get into trouble. This angrily upsets McKay, but Carter attempts to bribe the kids by saying “We’ll get you what ever you want.” Knowing exactly what a pair of ten-year-old boys would want, McKay states that is brilliant and tells Carter to take her shirt off. Carter says “I think we can reason with them without going into that” and McKay turns to Keller, who says nothing and does nothing.

After the kids leave, the trio talk about Radek Zelenka, after Carter was trapped with him during the quarantine lockdown, and all agree that they find him weird. The women then wonders what happened between them and Katie Brown. He told her that he needed some time to figure out his emotional problems. However, Katie interpreted that as McKay breaking up with her and she has been put on the list for return to Earth. McKay assumes its for the best, but Keller thinks that she deserves to be with a nice guy like him. This seems to cheer McKay up. They then hear the kids returned, but just came here to win a bet with their friends. As McKay barks at them, another tremor strikes the area. They have to move fast, as the facility is becoming more unstable.

They finish with the rope, and McKay insists on throwing it through the whole. However several attempts later, McKay still can’t do it. One attempt hit a gas pipe, which ignites. Carter quickly stops it. Carter then has a go and succeeds in sending the rope through. Unfortunately, the hook just simply throws back, sending more earth in its path. With this plan in the toilet, McKay has another idea. Using the rope to the metal beams, they could make a bridge using planks to put up a crate on it, and climb to safety. However, there’s a problem, the planks aren’t long enough to make it from one metal beam to another.

Keller, however, has an idea on how to make it work, by a simple bar trick; they use three planks in a way that it could support the crates. Keller demonstrates with knives and cups in their packs. After the demonstration, they get on it. They line up the planks to form the bridge, and place a crate in the middle. Afterwards, Carter attempts to get on the crates, and manages to reach the hole, and is about to grab hold of it, when the bridge collapses. Carter falls 25 feet down and breaks a leg. As Keller tends to her, she finds out that she has about an hour until the internal bleeding could get severe.

McKay then has another idea on how to escape, by using the hook and rope option, except this time, they use the gas pipe. McKay constructs a cannon and fills it with some gas. He then places the rope on the cannon and then uses a detonator to ignite the gas. As Keller carefully aims it at the hole, the rope is fired out of the hole and catches some ground. McKay pulls the rope, so the hook can grip some land. However, the more he pulls, more earth is dropping down to the facility, gaining more weight. The facility’s metal stilts starts to buckle under the strain. Keller falls backwards through the red door and is falling. However, she has hold of the rope, and McKay tries to hold on, causing pain in his hands in the process.

As McKay tries to pull her up, Keller tells him to stop, since she can see light, a mine shaft coming out to the open. Keller is able to swing and makes it into the tunnel. However, this causes McKay’s hands to bleed. But he insists on taking Carter down, since her leg is broken. McKay makes a make-shift seat for her, and ropes her down, where she is able to swing to safety. Now she’s safe, it’s now McKay turn. He goes down, but pauses when it is time to swing. He admits that after four years of “shooting guns, running around, and saving people”, he should be better at it by now, but isn’t. He takes a break, when he feels the rope starts to snap. He swings and makes it to the tunnel with the women. Just after, they see the facility completely collapse, and falls down the chasm.

Carter, McKay and Keller make their way back to Atlantis. Keller tells McKay that he lost a bet with the bar trick and that he owes her a drink. However, McKay is oblivious to being asked out in this intimate moment. Which Keller asks him again, clarifying and they leave together.

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