"Walking Tall" is the second episode of the twelfth season of Grey's Anatomy and the 247th produced episode of the series. It is also the 358th produced episode of the Grey's Anatomy franchise. It was broadcast on October 1, 2016.
On her first day as Chief of Surgery, the pressure mounts for Bailey as she strives for perfection, but she soon realizes the struggles of being a leader when she pushes her attending too far when faced with a deadly pituitary gland tumour on a woman who has grown exceptionally tall while Meredith grows frustrated when she is forced to pick up the slack for the work Bailey left behind. Meanwhile, April is placed in quarantine when she breaks out in a suspisious rash, escalating her marital issues with Jackson while tensions mount between Stephanie and Jo when Jo begins to feel her peers are outshining her. Amelia and Owen struggle to navigate their romantic waters while Arizona learns that Callie has started dating.
- "The body has approximately 11 organ systems all doing different things at the same time. In order to keep us functioning or, well alive, they need one voice, a leader, a master and in our brains, that job belongs to the pituitary gland. It senses the body's needs before the even arise, working non-stop. The pituitary gland communicates with all the other glands, telling them when to produce the vital hormones we need to function. It keeps everything running smoothly, in perfect order. There's no denying it, it has the toughest job in the place."
- "Without a strong leader the whole machine's out of whack. And it's pretty simple, if the brain's working the body will listen. Your limbs will hold you up, you're lungs want to breathe, you're heart wants to beat but none of them are any good without the brain. The brain keeps everything all together. Like a boss."
- "All About That Bass" - Tyler Ward & Two Worlds
- "Since U Been Gone" - Ian Keaggy
- "Keep An Eye On Me" - Frida Sundemo
- "Shake It Off" - Us The Duo
This episode's title originated from the song Walking Tall, originally sung by Val Doonican.