Dr. George O'Malley - Grey's Anatomy

Grey's Anatomy

Main cast, played by T.R. Knight

Episode 1x01: A Hard Day's Night (Mar 27, 2005)
Episode 1x02: The First Cut Is the Deepest (Apr 3, 2005)
Episode 1x03: Winning a Battle, Losing the War (Apr 10, 2005)
Episode 1x04: No Man's Land (Apr 17, 2005)
Episode 1x05: Shake Your Groove Thing (Apr 24, 2005)
Episode 1x06: If Tomorrow Never Comes (May 1, 2005)
Episode 1x07: The Self-Destruct Button (May 8, 2005)
Episode 1x08: Save Me (May 15, 2005)
Episode 1x09: Who's Zoomin' Who? (May 22, 2005)
Episode 2x01: Raindrops Keep Falling on My Head (Sep 25, 2005)
Episode 2x02: Enough Is Enough (No More Tears) (Oct 2, 2005)
Episode 2x03: Make Me Lose Control (Oct 9, 2005)
Episode 2x04: Deny, Deny, Deny (Oct 16, 2005)
Episode 2x05: Bring the Pain (Oct 23, 2005)
Episode 2x06: Into You Like a Train (Oct 30, 2005)
Episode 2x07: Something to Talk About (Nov 6, 2005)
Episode 2x08: Let It Be (Nov 13, 2005)
Episode 2x09: Thanks for the Memories (Nov 20, 2005)
Episode 2x10: Much Too Much (Nov 27, 2005)
Episode 2x11: Owner of a Lonely Heart (Dec 4, 2005)
Episode 2x12: Grandma Got Run Over by a Reindeer (Dec 11, 2005)
Episode 2x13: Begin the Begin (Jan 15, 2006)
Episode 2x14: Tell Me Sweet Little Lies (Jan 22, 2006)
Episode 2x15: Break on Through (Jan 29, 2006)
Episode 2x16: It's the End of the World (Feb 5, 2006)
Episode 2x17: As We Know it (Feb 12, 2006)
Episode 2x18: Yesterday (Feb 19, 2006)
Episode 2x19: What Have I Done to Deserve This? (Feb 26, 2006)
Episode 2x20: Band-Aid Covers the Bullet Hole (Mar 12, 2006)
Episode 2x21: Superstition (Mar 19, 2006)
Episode 2x22: The Name of the Game (Apr 2, 2006)
Episode 2x23: Blues for Sister Someone (Apr 30, 2006)
Episode 2x24: Damage Case (May 7, 2006)
Episode 2x25: 17 Seconds (May 14, 2006)
Episode 2x26: Deterioration of the Fight or Flight Response (May 15, 2006)
Episode 2x27: Losing My Religion (May 15, 2006)
Episode 3x01: Time Has Come Today (Sep 21, 2006)
Episode 3x02: I Am a Tree (Sep 28, 2006)
Episode 3x03: Sometimes a Fantasy (Oct 5, 2006)
Episode 3x04: What I Am (Oct 12, 2006)
Episode 3x05: Oh, the Guilt (Oct 19, 2006)
Episode 3x06: Let the Angels Commit (Nov 2, 2006)
Episode 3x07: Where the Boys Are (Nov 9, 2006)
Episode 3x08: Staring at the Sun (Nov 16, 2006)
Episode 3x09: From a Whisper to a Scream (Nov 23, 2006)
Episode 3x10: Don't Stand So Close to Me (Nov 30, 2006)
Episode 3x11: Six Days, Part 1 (Jan 11, 2007)
Episode 3x12: Six Days, Part 2 (Jan 18, 2007)
Episode 3x13: Great Expectations (Jan 25, 2007)
Episode 3x14: Wishin' and Hopin' (Feb 1, 2007)
Episode 3x15: Walk on Water (Feb 8, 2007)
Episode 3x16: Drowning on Dry Land (Feb 15, 2007)
Episode 3x17: Some Kind of Miracle (Feb 22, 2007)
Episode 3x18: Scars and Souvenirs (Mar 15, 2007)
Episode 3x19: My Favorite Mistake (Mar 22, 2007)
Episode 3x20: Time After Time (Apr 19, 2007)
Episode 3x21: Desire (Apr 26, 2007)
Episode 3x22: The Other Side of This Life (1) (May 3, 2007)
Episode 3x23: The Other Side of This Life (2) (May 3, 2007)
Episode 3x24: Testing 1-2-3 (May 10, 2007)
Episode 3x25: Didn't We Almost Have It All (May 17, 2007)
Episode 4x01: A Change Is Gonna Come (Sep 27, 2007)
Episode 4x02: Love/Addiction (Oct 4, 2007)
Episode 4x03: Let the Truth Sting (Oct 11, 2007)
Episode 4x04: The Heart of the Matter (Oct 18, 2007)
Episode 4x05: Haunt You Every Day (Oct 25, 2007)
Episode 4x06: Kung Fu Fighting (Nov 1, 2007)
Episode 4x07: Physical Attraction... Chemical Reaction (Nov 8, 2007)
Episode 4x08: Forever Young (Nov 15, 2007)
Episode 4x09: Crash Into Me, Part 1 (Nov 22, 2007)
Episode 4x10: Crash Into Me, Part 2 (Dec 6, 2007)
Episode 4x11: Lay Your Hands on Me (Jan 10, 2008)
Episode 4x12: Where the Wild Things Are (Apr 24, 2008)
Episode 4x13: Piece of My Heart (May 1, 2008)
Episode 4x14: The Becoming (May 8, 2008)
Episode 4x15: Losing My Mind (May 15, 2008)
Episode 4x16: Freedom (1) (May 22, 2008)
Episode 4x17: Freedom (2) (May 22, 2008)
Episode 5x01: Dream a Little Dream of Me (1) (Sep 25, 2008)
Episode 5x02: Dream a Little Dream of Me (2) (Sep 25, 2008)
Episode 5x03: Here Comes the Flood (Oct 9, 2008)
Episode 5x04: Brave New World (Oct 16, 2008)
Episode 5x05: There's No 'I' in Team (Oct 23, 2008)
Episode 5x06: Life During Wartime (Oct 30, 2008)
Episode 5x07: Rise Up (Nov 6, 2008)
Episode 5x08: These Ties That Bind (Nov 13, 2008)
Episode 5x09: In the Midnight Hour (Nov 20, 2008)
Episode 5x10: All by Myself (Dec 4, 2008)
Episode 5x11: Wish You Were Here (Jan 8, 2009)
Episode 5x12: Sympathy for the Devil (Jan 15, 2009)
Episode 5x13: Stairway to Heaven (Jan 22, 2009)
Episode 5x14: Beat Your Heart Out (Feb 5, 2009)
Episode 5x15: Before and After (Feb 12, 2009)
Episode 5x16: An Honest Mistake (Feb 19, 2009)
Episode 5x17: I Will Follow You Into the Dark (Mar 12, 2009)
Episode 5x18: Stand by Me (Mar 19, 2009)
Episode 5x19: Elevator Love Letter (Mar 26, 2009)
Episode 5x20: Sweet Surrender (Apr 23, 2009)
Episode 5x21: No Good at Saying Sorry (Apr 30, 2009)
Episode 5x22: What a Difference a Day Makes (May 7, 2009)
Episode 5x23: Here's to the Future (May 14, 2009)
Episode 5x24: Now or Never (May 14, 2009)

Guest cast, played by T.R. Knight

Episode 17x04: You'll Never Walk Alone (Dec 3, 2020)