She's escaped from a high security prison and killed many men so she can process part of the intersect. Chuck is trained in the art of seduction by an old time James Bond type spy with disastrous and hilarious results. When the plan goes wrong and Casey and Sarah are captured it's up to Chuck to leap ( literally ) to the rescue.
Back at the Buy More Lester is now assistant manager and is bullying the staff into working, when he sack's Morgan the rest of the crew Anna, Jeff et all walk out and he has to grovel to get them back before Big Mike finds out.
Oh and Bryce is back, not sure why, I know he has a fan base but I never liked the character and don't want him coming between Chuck and Sarah.
This season just gets better and better. I didn't think the writers could top last week's season opening episode but this was just brilliant.