I don't have that much to say about this eppy, because it was obviously rather a filler episode. Nothing really happened and that plague storyline was a little strange. I thought they were done with all this mystery crap after Jodi had those flashbacks. But obviously they aren't. :-/
Don't know what to think of the new guy, but I know I definitely don't like Ashleigh. And why is Patrick letting her jump him? He's obviously had the hearts for Tyler. Now what changed? It's the same old story: now she'll fall for him and be unhappy. But at least she's starting to grow on me. She kinda belongs with them now.
One last thing: Kate is getting a little boring. She used to be so tough and ever since she's been back, she just wasn't herself. She needs to start getting all bossy again or at least start making out with Riley :D