Season 1 Episode 22
Episode: "Symbiosis"

The Enterprise's mission to observe the flare activity of a star is interrupted by a distress call from a freighter in danger of destruction from a decaying orbit. Interference from the local star's radiation complicates the rescue operation resulting in the freighter's destruction however several of the passengers are at least rescued; them and their cargo. We learn that the cargo is in fact medicine, containing over 4-billion doses of a drug called felicium, manufactured by a race called the Brekkians. For generations a race on a neighbouring planet, the Ornarans have been struck down by a planet-wide plague. Having discovered long ago that felicium can address their symptoms, the Ornarans have maintained a long running trade agreement with the Brekkians for regular deliveries of the drug.

Data presents what he has learned regarding the history behind the trade relationship that exists between the Brekkians and the Ornarans. On the surface of it, the relationship between the two worlds comes across as somewhat equitable, that is until Beverly Crusher adds what she has just discovered about the so-called "medicine" the Brekkians have been peddling to the Ornarans and that actually the relationship isn't as mutually beneficial as the Brekkians claim it to be.

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