For the geeks of us, the drug used to mind control prisoners was called Pylene-50. It neutralised rebel tendencies making the subject docile and obedient. The prisoner was ordered to return to the rebels, carrying a hidden bomb, and to set it off when they were there.

I concur. One of my all-time favourite shows and this question perfectly describes the episode "Traitor".

@Eric Soyke I think there was a 1989 movie called "Millennium" with a similar premise but they were taking passengers from doomed aircraft to populate the future.

"This is also true for e.g. lions and tigers or bears" Oh my!

This is it :O Thanks for finding this for me! :D

No, the colouring you mention is about right but this was an A5 sized hardback book with no author or editor names on the cover (that I recall).