2 Works in Big Bang Big Bang
Kripke is pretty much okay with this weird little friendship he has going on with Zack and Stuart (really, he is, believe it or not). That is, until one evening when Kripke comes home to find he's been broken into and Zack offers him a place to stay. After that, everything starts to go upside-down; Stuart doesn't know how to keep his mouth shut and Zack... well, Zack won't stop being Zack. And somewhere in the middle of it all is a Superman action figure who probably knows how to make everything right but he's not talking.
Life as a new FBI recruit is nothing like Penny expected, but it's better than sitting around waiting for Kurt to grow up. Until she gets pulled out of training a few weeks early, that is. On the plus side: no more pre-dawn obstacle course runs; but partnering with the Bureau's resident crackpot? This is so not what she signed up for. She's ready to toss her shiny new (provisional) badge in the Potomac, until Agent Cooper gives her a look at the first case they'll be investigating - something the Bureau hasn't seen in almost fifty years.