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
Did You Know?
This is one of the few Fourth Doctor stories to have a strong moral message, in this case against drug abuse and the illegal drug trade. The drug in question was originally going to be called "xylophilin", or "zip". However, Lalla Ward was worried that the name would sound appealing to children, so it was changed to "vraxoin" instead. However, K-9 still mentions vraxoin as having the scientific code "XYP". See more
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.