![](https://image.tmdb.org/t/p/original/r6G5BoHmrA15MsMwwDPJY6x38f1.jpg)
![](https://image.tmdb.org/t/p/w342/xjm6uVktPuKXNILwjLXwVG5d5BU.jpg)
Code Yellow
Yo-Yo and Keller take things public; parasitic aliens threaten the human race; and someone really needs boba.
Writing:
Stars:
- Joss Whedon
- Jed Whedon
- Maurissa Tancharoen
Stars:
![](https://image.tmdb.org/t/p/w300/qtr5i6hOm6oVzTYl3jOQAYP3oc7.jpg)
![](https://image.tmdb.org/t/p/w300/kZnGkJdK5KGvx2oHnQ9ozrdb0hs.jpg)
![](https://image.tmdb.org/t/p/w300/6v3tgDQMYGfOv5a8jUJd2S45F5z.jpg)
![](https://image.tmdb.org/t/p/w300/jOrfoGipT8QoDi54Qd9f5yhJCgw.jpg)
Other episodes for this season
![Missing Pieces](https://image.tmdb.org/t/p/w300/8Oi4EnmkjvKvRcr6Gl55AZPZafS.jpg)
![Window of Opportunity](https://image.tmdb.org/t/p/w300/6hGD1KKJ5WsrEDr09AQXjFunx7B.jpg)
![Fear and Loathing on the Planet of Kitson](https://image.tmdb.org/t/p/w300/cs8UQk3j0pthMFcEvj06h6mPQEF.jpg)
![Code Yellow](https://image.tmdb.org/t/p/w300/r6G5BoHmrA15MsMwwDPJY6x38f1.jpg)
![The Other Thing](https://image.tmdb.org/t/p/w300/soFPb57Fmcx3zOjxflS5L6QWjpg.jpg)
![Inescapable](https://image.tmdb.org/t/p/w300/3KvpgeeQEJ1Fu1cH4YPvd4RCoRR.jpg)
![Toldja](https://image.tmdb.org/t/p/w300/aCKSrJYMGZPXSW0PRuMBCJta5z2.jpg)
![Collision Course (1)](https://image.tmdb.org/t/p/w300/pBvPVdJvKzDj7I8vWGZfl7oHWpJ.jpg)
![Collision Course (2)](https://image.tmdb.org/t/p/w300/pzzfipYotpyi3ETxKMxBvbDXHFl.jpg)
![Leap](https://image.tmdb.org/t/p/w300/nJCHJRs6CtluaXxNDwWLeNO1iqd.jpg)
![From the Ashes](https://image.tmdb.org/t/p/w300/pyCuhWEU2q7PkQVfpMUxKXqfetx.jpg)
![The Sign](https://image.tmdb.org/t/p/w300/giYsOCMPfRjf1xjdGuzXnH24Ejg.jpg)
![New Life](https://image.tmdb.org/t/p/w300/jRrgeEvci7Bk54zyhNI4nfjqYP4.jpg)