I wanted to kill them both but didn't because of Clem. You know the character development is amazing when you make decisions that may affect other characters like that.
Yeah it really is, great stuff by the game devs.
Do you have to buy each episode?
Definitely get the game, as Intermission said, one of the best games of the year so far if not the best.
You can buy each episode for $5 each, or you can buy the "Season Pass" which is all 5 episodes in the season, and each time a new episode is released you get it (it's basically just confirming you will get all the episodes on release without having to go through menus and buy the next one and all that).
Each episode is 2-3 hours long, and so worth it. At the end of the season (5 episodes), you're looking at $25 for a 10-15 hour game that is quite amazing. Most games are 10-15 hours for $60, if you want to look at it that way.