*When O'Neill returns to Earth, he too begins experiencing the symptoms of depression, and tests reveal that a chemical imbalance is the cause. The members of SG-5 have died, and Daniel has slipped into a coma, moments from death. The answer appears to lie with the enigmatic light, and desperate to save Daniel's life, O'Neill carries him back through the gate to P4X-347. Once there, both men begin to recover, and it becomes apparent that proximity to the light's radiation causes euphoric highs, while distance results in critical withdrawal and death. SG-1 is trapped on the planet.
*Source: back of card.