Those pesky goa’uld are up to no good and they are intent on taking Earth and the SGC out. Singularity brings trouble into the Cheyenne complex in this episode written by Robert C. Cooper, which first aired on 31 October, 1997.

When SG-1 travels through the gate to find the previous team, and a number of the world’s inhabitants dead, they are worried that something from Earth may have caused the problem, or perhaps the team has brought back some pathogen with them.

They didn’t it’s all a gambit organized by the goa’uld. They’ve planted a Trojan horse, and they could destroy the entire planet.

Carter (Amanda Tapping) finds a young survivor on the planet, Cassandra (Katie Stuart), and the two create a bond immediately. They take the young girl back to Earth, where she seems to be suffering some form of heart arrhythmia.

What Carter and Frasier (Teryl Rothery) find is that Cassandra has naquadah in her body, the same material that can be found in the gate. But it’s been manipulated, in effect turning Cassandra into a bomb. And it’s about to go off!

Hammond (Don S. Davis) orders O’Neill (Richard Dean Anderson) and the team to take Cassandra to a stories-deep silo and leave her there to die, but Carter refuses to leave the girl’s side, playing a hunch, and refusing to desert the young girl has grown to mean a lot to her.

Things get sorted, but Cassandra can’t go home again, but that’s okay, she gets a new home, says she’s from Toronto, gets a dog, and possibly a new family – Frasier may adopt her. And the team lives to fight and explore for another day!

Cor-ai launched on 23 January, 1998 and was written by Tom J. Astle and gives us a bit of a courtroom story, albeit on an alien world.

When SG-1 arrives on Cartago, Teal’c (Christopher Judge) reveals that he has been here before, when he served Apophis. The planet was held by the goa’uld and the inhabitants harvested to be Children of the Gods or slaves. When they see Teal’c, they arrest him for murder so that they can put him on trial, a cor-ai, and feel they received some form of justice.

Teal’c insists they stay and honour the planet’s justice system, he will face the consequences of his actions.

As the proceedings get underway, the team rallies around Teal’c to protect and help their friend to show that he is no longer the same man. But can Hanno (David McNally) be persuaded of the change n the jaffa considering that Teal’c killed his father?

Things escalate with the arrival of some jaffa and SG-1 will have to defend the planet, even with Teal’c’s fate in the balance.

The episode explores the idea of impartiality and the importance of such a thing in the seeking of justice.