Henry
Autoexreginated
WARNING:
Do not hinge your plot on their capture. Chances are that (1) They'll resent you for it, or (2) At least one of the PCs will manage to escape no matter what, and destroy said plans. Remember: a 20 always saves.
If you plan to do it, either (1) write it into the story as in "you all wake up from the powerful sleep poison, and are captured. What do you want to do to escape?" or (2) be sure you've planned for the eventuality that SOME will escape, and some will be captured or killed. It's a great story element for "Prison Break" stories and movies, but I've rarely seen it work well for role-playing games. (In fact, the only time I saw it work well was for Gary Gygax, and he just wrote it into the plot. Back then, it was original for RPG's, so few people complained.)
Do not hinge your plot on their capture. Chances are that (1) They'll resent you for it, or (2) At least one of the PCs will manage to escape no matter what, and destroy said plans. Remember: a 20 always saves.

If you plan to do it, either (1) write it into the story as in "you all wake up from the powerful sleep poison, and are captured. What do you want to do to escape?" or (2) be sure you've planned for the eventuality that SOME will escape, and some will be captured or killed. It's a great story element for "Prison Break" stories and movies, but I've rarely seen it work well for role-playing games. (In fact, the only time I saw it work well was for Gary Gygax, and he just wrote it into the plot. Back then, it was original for RPG's, so few people complained.)