| Episode credited cast: | |||
| Charlie Day | ... | Charlie Kelly | |
| Glenn Howerton | ... | Dennis Reynolds | |
| Rob McElhenney | ... | Mac | |
| Kaitlin Olson | ... | Dee Reynolds | |
| Danny DeVito | ... | Frank Reynolds | |
| Mary Elizabeth Ellis | ... | Waitress | |
| Brittany Daniel | ... | Carmen | |
| Marcuis Harris | ... | Pimp | |
| Rest of cast listed alphabetically: | |||
| Bill Chott | ... | Gary | |
| Sandy Martin | ... | Mac's Mom | |
When a serial killer is loose in Philadelphia who targets blonde white women, the gang all tries to figure it out. So Dennis and Dee notice that Mac is visiting an unknown apartment everyday and suspect it to be him. So they decide to find out who the serial killer is by doing various experiments. Written by James Hake
This episode embodies everything I love about the show and it's characters.
The introduction of lawyer Charlie is my favorite part about the episode because he gets so wrapped up in his character that it's really funny and charming.
If there's an episode that I have to use to introduce someone to this show, I think it would be this one.