It's happened to every DM: Some clever PC decides to cast teleport, and when he confidently drops his percentile dice on the table, up comes the dreaded "similar area" result.

So what happens? Well, typically the game grinds to a halt while the DM digs for an appropriate encounter, if he doesn't give up altogether and just ask the player to re-roll. Well, with this Side Trek, you won't lack for an interesting option the next time one of your players rolls this result. Get ready to spring an appropriately nasty surprise on your players as they invade the lair of some particularly nasty creatures -- who aren't happy about being disturbed in their plotting.