21x1 - Different Worlds: Part 1

September 23, 2006

21x2 - Different Worlds: Part 2

September 24, 2006

21x3 - Waste of Space

September 30, 2006

21x4 - Heads Together

October 1, 2006

21x5 - Sons and Lovers

October 8, 2006

21x6 - Angels and Demons

October 15, 2006

21x7 - What You See Is What You Get

October 22, 2006

21x8 - Born to Be Wild

October 29, 2006

21x9 - To Be a Parent

November 11, 2006

21x10 - It's Now or Never

November 18, 2006

21x11 - All Through the Night

November 25, 2006

21x12 - No Place Like...

December 2, 2006

21x13 - The Edge of Fear

December 9, 2006

21x14 - In Good Faith

December 16, 2006

21x15 - Killing Me Softly

December 23, 2006

21x16 - Silent Night

December 24, 2006

21x17 - The Sunny Side of the Street: Part 1

December 30, 2006

21x18 - The Sunny Side of the Street: Part 2

December 31, 2006

21x19 - Fish Out of Water

January 6, 2007

21x20 - Stormy Weather

January 13, 2007

21x21 - The Personal Touch

January 20, 2007

21x22 - Countdown

January 27, 2007

21x23 - The Silence of Friends

February 3, 2007

21x24 - No Return

February 10, 2007

21x26 - The Killing Floor

February 24, 2007

21x27 - Combat Indicators: Part 1

March 3, 2007

21x28 - Combat Indicators: Part 2

March 7, 2007

21x29 - Sweet Charity

March 10, 2007

A special episode to link in with the Red Nose Day charity appeal.

21x30 - A World Elsewhere

March 17, 2007

21x31 - Stitch

March 18, 2007

21x32 - Life's Too Short

March 24, 2007

21x33 - Day One

March 31, 2007

21x34 - Lost in the Rough

April 7, 2007

21x35 - Lush

April 14, 2007

21x36 - Aliens

April 28, 2007

21x37 - Close Encounters

May 5, 2007

21x38 - A Long Way From Home

May 19, 2007

21x39 - The Apostate

May 26, 2007

21x40 - Communion

June 2, 2007

21x41 - Brass in Pocket

June 9, 2007

21x42 - Entropy

June 16, 2007

21x43 - It Never Rains...

June 23, 2007

21x44 - Lie to Me

June 30, 2007

21x45 - The Fires Within

July 14, 2007

21x46 - Walking the Line

July 21, 2007

21x47 - Seize the Day

July 28, 2007

21x48 - To Love You So

August 4, 2007