Disappearances happen in science. Disease can suddenly fade away, tumors go missing, and we open someone up to discover the cancer is gone. It's unexplained, It's rare, but it happens. We call it mis-diagnosis, say we never saw it in the first place, any explanation but the truth. That life is full of vanishing acts. If something that we didn’t know we had disappears, do we miss it?

Walk on Water is the fifteenth episode of the third season and the 51st overall episode of Grey's Anatomy.

Short SummaryEdit

A catastrophic mass casualty incident has the interns (sans Cristina) sent into the field with Bailey to do damage control. Back at the hospital, the Chief has dyed his hair and Addison is the only person who defends him. Cristina wants to tell Meredith about her engagement, and wants Meredith to hear it from her first - not easy when word begins to spread among the attendings.

Full SummaryEdit

Meredith is lying in a tub still and suddenly she's goes under. Derek comes in and wonders what she's doing. He calls her name and pulls her out of the tub and then leaves. Moments later, Meredith tells Derek and Izzie that she wasn't drowning or wanting to die.

At the hospital, Cristina tells Preston to wait until she tells her Meredith about their engagement. She wants to tell her friend and Preston says Derek is my friend. She says to not tell Derek because he will tell Meredith.

Everyone in the elevator including Addison is looking at Richard's head. Derek comes in the elevator and notice his hair color has changed. Addison tells them to leave him alone while the others are saying why the change.

At the newly established clinic, Sydney comes down to help Miranda and her interns practice how to determine patients' injuries. Richard comes in and tells Miranda to put together a triage team because there has been a mass casaulity incident. Cristina stays at Seattle Grace Hospital to handle the incoming patients, while Miranda, Meredith, Izzie, George and Alex arrive and see multiple traumas from the ferry boat accident which caused the container ship clip the boat. The interns don't know where to start first, but Miranda tells them to just go help. Meredith finds a little girl afraid and crying. She won't let go Meredith's hand and so she takes her along.

Derek tells Preston of his love for ferry boats. Preston tells Derek he is his friend and Derek concurs. Preston then tell Derek he is engaged with Cristina and not to tell anyone, but Mark caught that and says congratulations.

(....more to come)


  • Meredith Grey
  • Cristina Yang
  • Izzie Stevens
  • Alex Karev
  • George O'Malley
  • Miranda Bailey
  • Richard Webber
  • Addison Montgomery
  • Callie Torres
  • Mark Sloan
  • Preston Burke
  • Derek Shepherd
  • Jane Doe
  • Sydney Heron
  • Vince
  • Carly Height
  • Rick's Friend
  • Ellis Grey
  • Greg
  • Rick
  • Scared Guy
  • Angry Woman
  • Scared Guy #2
  • Lisa the Child
  • Businessman
  • Cop (left, with Lisa)
  • Paramedic #7
  • Police Officer
  • Paramedic #2
  • Paramedic Nicole
  • Paramedic #1

Main CastEdit

Guest StarsEdit



Medical NotesEdit

Ellis GreyEdit

  • Diagnosis:
    • Alzheimer's disease
  • Doctors:
  • Treatment:

Ellis was still in the hospital after her heart surgery.

Meredith's First PatientEdit

  • Diagnosis:
    • Minor injuries
  • Treatment:
    • Oxygen

Meredith told a woman she had minor injuries and would be taken to the hospital.


  • Diagnosis:
  • Treatment:

Burke rescheduled a patient's valve replacement to free up an OR for incoming traumas.

Jason KayEdit

  • Diagnosis:
  • Treatment:

Sydney called Jason Kay up to be examined in the clinic.


  • Diagnosis:
    • Chest injuries
    • Leg injuries
    • Broken arm
    • Crush injuries
    • Blown pupil
    • Seizure
  • Treatment:
    • Closed reduction

Rick was trapped under a car. He had injuries to his chest and leg as well as a broken arm. Izzie also guessed that there was damage to his spine and pelvis, but she couldn't be sure because he was still trapped. Izzie used bandages and gauze to treat as much as she could, but decided to reduce his arm break to help with the pain. As she continued to treat him, he passed out. Izzie noted a blown pupil just before he started seizing.

Alex's PatientEdit

  • Diagnosis:
  • Treatment:
    • Oxygen

Alex sent a patient to the treatment area to be patched up.

Jane DoeEdit

  • Diagnosis:
    • Pregnancy
    • Facial injuries
    • Hypothermia
    • Crush injuries
  • Treatment:
    • Surgery

Alex found a pregnant woman under a pylon. He believed she was dead and tagged her as such, but as he went to leave, he heard her moan and saw her hand moving, so he pulled the pylon off her body and got her into an ambulance to be taken to the hospital. In the ambulance, she had to be placed on her side to bring her blood pressure up. They took her from the ER to get tests and then scheduled surgery.

Carly HeightEdit

  • Diagnosis:
    • Open abdominal wound
    • Evisceration
  • Treatment:
    • Surgery

Carly, 45, was injured, but was more concerned with finding her son than getting treated. She finally agreed to surgery when George lied and told her they found her son.

Derek's PatientEdit

  • Diagnosis:
  • Treatment:
    • Bandaging

Derek and Meredith bandaged a patient before sending her to the hospital.

Bailey's PatientEdit

  • Diagnosis:
  • Treatment:

Bailey rode back to the hospital with a patient.

Business ManEdit

  • Diagnosis:
    • Leg laceration
  • Treatment:
    • Stitches

Meredith treated a man who had a large gash on his leg. She stitched his wound up and set him to go to the hospital, but he lashed out and knocked Meredith off the pier into the water.

Callie's PatientEdit

  • Diagnosis:
  • Treatment:
    • Surgery

Callie told George she had a patient who needed surgery. The patient was later identified as Chris Height.

Identified PatientsEdit

  • Diagnosis:
  • Doctors:
  • Treatment:

Alex brought a list of identified patients to the group waiting in the ER: John Jay Anders and Curt Demorat were on the list.


Song Performer Scene
"The Hop" Radio Citizen
  • Meredith is lying in the tub. She goes underwater, which scares Derek, who pulls her up out of the water.
  • They argue about Meredith's mother. Meredith says she's fine.
  • Izzie tells Meredith there's no judgment from her.
"Opposite Direction" Union of Knives
  • The interns ask Bailey what to do and she tells them she can't hold their hands before sending them out to help people.
  • George sees the carnage.
  • Meredith treats a patient and then spots a little girl alone.
"Liar" 8MM
  • Izzie sends her patient's friend out with a tag to get help.
  • Derek and Meredith work on a patient together.
  • Meredith continues walking the little girl to the tent.
  • Addison is working to clear as many beds as she can.
  • The first wave from the scene is expected soon.
  • Addison says she dyed her hair blonde after Derek left her. Change is good.
"Make This Go On Forever" Snow Patrol
  • Alex talks to Jane Doe before her surgery.
  • Addison comes to take her for surgery and sends Alex back to the clinic.
  • Bailey tells Carly she needs surgery. George comes in.
  • Izzie continues her work.
  • Alex brings the list of patients to the waiting room. They're upset because it's the same list they already had.
  • At the scene, Meredith finishes treating her patient, but in pain, he pushes her off the edge into the water.
  • The girl turns and walks away from the edge of the water.

Notes and TriviaEdit

Grey's Anatomy Walk On Water Promo 300:36

Grey's Anatomy Walk On Water Promo 3.15

  • This episode's title originated from the song Walk on Water, originally sung by Aerosmith.
  • This episode scored 25.20 million viewers.
  • This was one of the most expensive episodes of the show to shoot, due to all the green screens and tons of extras.
  • The scenes at the ferry crash site were shot at the Santa Anita race track.


Episode StillsEdit

Behind the ScenesEdit


Callie: This is weird. Weird. This is weird, right?
Bailey: I need more triage tags...
Callie: Working with someone I’m married to is weird. Here, I’m his boss and his wife. At work, I’m giving him orders, in bed... He’s giving me...
Bailey: Stop! Right there, I don’t need to know this. I’m tired, I’m busy. While I will concede that you and O’Malley have some challenges to overcome, I’m asking you to remember that this day is a marathon and my mind can only hold what it needs to know, your sex life cannot be held in my mind today... Ever! It cannot be in my mind ever! Never!
Callie: Whatever.

Cristina: Meredith, I have a
Meredith: You’re not pregnant again, are you? 'Cause I can’t handle the extra months of bitchiness.

Addison: (to Richard) I dyed my hair blonde... the day after Derek moved out. Change is good. Your marriage is over, you're starting over. So am I.

Richard: (to Mark) What's the news?
Mark: Shepherd and Grey are on the rocks. Burke and Yang got engaged. You need highlights in your hair. That's why it looks so odd. I'm gonna go save lives.

Alex: (to Jane Doe) Hey. I'm not going to be able to make it to your surgery today. (she reaches for his hand and grabs it) Here's the thing. You were crushed by a pylon. Dozens of people on that ferry boat died, but you're alive, so when I come back to check on you later, you better still be alive. Do you hear me?

See AlsoEdit

A complete overview of this episode's crew can be found here.

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