This episode would definitely have to be one of my favorites!
On the previous episode Charlie handed his drug stash to Locke and received his guitar for doing so but now he wanted his drugs back and Locke told him that he'd let him ask for them 3 times then he'd give them to him. Also on this episode Sayid, Boone and Kate were going to triangulate the French woman's broadcast where he almost found rescue but then he was hit on the head by a stick and knocked unconscious! Damn it! Who did it and Why???
The flashbacks about Charlie were awesome and how he had to avoid temptations with his brother and then he started using Drugs, it was sad but interesting! Half way through the episode Charlie yelled at Jack and then Jack got trapped in a cave-in. When Sawyer tried to tell Kate about what had happened she didn't want to hear anything from him because she was angry but eventually she found out. At the end they finally rescued him and then Charlie asked Locke for his drugs for the third time so Locke gave them to him and then he flicked it into the fire! Great choice he made!
Overall a wonderful episode that I'll never forget!