Stargate mafia Day one

As the trapped people tried to think of a way out, McKay started snapping his fingers.
“We find an alternative power source!” he said with delight.
“I’m going with that” with closed eyes says and agrees.
“But where can we find another power source here? The computer batteries won’t do us much good” Sam says.
“Perhaps this can be of assistance?” Teal’c says and pulls out his staff weapon.
Sam says “The liquid Naquadah that powers the staff should be enough to get the door open” and starts dissembling it.
“You mind hurrying up a bit?” O’Neill asks, rubbing his legs together.
Sam removes the liquid Naquadah core from the staff weapon and plugs it in to the door’s control panel. She waves her hand in front of it and the doors open.
They get greeted by the people who went out into the hallway, where the doors are locked as well.
“Hey guys, umm what happened?” foxi asks.
“We don’t know, but it seems like the city is in lockdown. We gotta get to the Gate room and get the power back” Sam says and O’Neill brushes by her.
“Excuse me” he says as he heads off for the bathroom.
“When you gotta go, you gotta go” boo says and Teal’c looks at him, raising an eyebrow.

Some time later, the people have opened every door to the Gate room  and are shocked to find everyone dead!
“Gun fire” Oli says as he looks closer at a body.
“Why would anyone do this?” McKay asks.
“I don’t know, but we gotta find ou-“
Just as Oli is speaking someone starts shooting at them. They all manage to take cover before they get hit.
Hellraiser leans out from a corner and looks at whoever the shooter is. He drags his head back just as a shot misses his head.
“I think there’s only one guy” Hellraiser says. “I think I can take him.”
“Indeed. I shall assist you, Hellraiser” Teal’c says.
“I’ll circle around and take him from the other side, and then you’ll run up and we both take him out.”
Teal’c nods as Hellraiser slips away and circles around to the other side of the room. As the shooter walks out from behind his hiding place Hellraiser jumps on him and knocks his gun away!
“Now! Get him!” he screams as Teal’c and O’Neill run up to him.
The shooter is dressed in a military outfit and stops struggling as Teal’c points his staff weapon right in his face.
“Who are you?” O’Neill asks as he grabs the gun off the floor.
The Ashraks eyes glow as he knocks Hellraiser off him and picks out a grenade.
“By decree of the Goa'uld System Lords you will die with dishonor!” he says and pulls the pin on the grenade. The explosion consumes the Ashrak and Hellraiser, killing them both.
Luckily for O’Neill and Teal’c they jumped away out of danger just in time.
“This is bad news” O’Neill says as he gets up. Teal’c grabs a hand device from the severed arm of the Ashrak, thinking that might come in handy.
In another part of the city, Ba’al finds a life sign detector but he is unable to activate it.

Some time later, McKay and Carter get the power back on in the city and all the doors open. In the infirmary, Dr blueray Keller checks her radio and gets contact with the other group.
Thor is looking around as he finds a jar of symbiote poison and Lya grabs a personal shield that had fallen from a desk.
“We’ve got a Goa’uld problem” Sheppard tells her over the radio.
“The Goa’uld?” How did they get here?” she says shocked.
“We don’t know, but they sent an Ashrak who killed everyone in the Gate room and shut the power off. He said he was sent by the System Lords before he…exploded”
“My God. Is anyone injured?”
“Hellraiser was killed in the explosion but the rest of us are fine”
“What's a Goa'uld?” Ronon asks as he also wonders where his gun is.

“ It's a slimy, snake-like alien creature -- burrows into people's heads and takes control of their bodies” blueray tells him.

“That doesn't sound pleasant.”

“It isn't. I've read enough S.G. mission reports to know I don't want anything to do with them.”

In the Gate room Weir tells Sheppard to organize some teams to do a search of the city. As Daniel Jackson is listening to this, he picks up Ronon’s gun and Sam finds a jar of the Hoffan drug.