A cruise ship loaded with passengers to the planet Azure collides with a trade ship as it comes out of warp, leaving the two ships merged but unstable. The Doctor, Romana and K-9 arrive to help out but discover there's also a problem with unidentified smugglers running a cargo of vraxoin, a forbidden organic drug that's as highly addictive as it is fatal. It instills the user with warm complacency and total apathy - the very qualities currently displayed by the cruise ship's bemused co-pilot. Written by
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Doctor, this is important scientific research. I am helping to conserve endangered species.
By putting them in this machine?
Ah, yes, of course. Just in the same way a jam maker conserves raspberries, ha-ha.
[after the Doctor leaves
Oh, don't mind him. He just likes to irritate people.