Two Kisses, One Party
Episode: 4x01 | Airdate: Jul 19, 2008
Episodes
Open Mic Plight
Episode: 4x02 | Airdate: Jul 27, 2008
Just Friends
Episode: 4x03 | Airdate: Aug 12, 2008
March Break
Episode: 4x04 | Airdate: Aug 26, 2008
6 1/2
Episode: 4x05 | Airdate: Sep 12, 2008
Derek Denies Denial
Episode: 4x06 | Airdate: Sep 23, 2008
Happy New Schoolyear
Episode: 4x07 | Airdate: Oct 7, 2008
No Secrets
Episode: 4x08 | Airdate: Oct 21, 2008
Take a Stepkid to Work
Episode: 4x09 | Airdate: Nov 4, 2008
No More Games
Episode: 4x10 | Airdate: Nov 18, 2008
How I Met Your Stepbro
Episode: 4x11 | Airdate: Dec 2, 2008
Casey & Ralph?!
Episode: 4x12 | Airdate: Dec 16, 2008
Tuesday Afternoon Fever
Episode: 4x13 | Airdate: Dec 30, 2008
Teddy's Back
Episode: 4x14 | Airdate: Mar 4, 2009
Rude Awakenings
Episode: 4x15 | Airdate: Mar 11, 2009
Truman's Last Chance
Episode: 4x16 | Airdate: Mar 18, 2009
Surprise!
Episode: 4x17 | Airdate: Mar 25, 2009
Futuritis
Episode: 4x18 | Airdate: Mar 25, 2009
Vacation With Derek
Episode: S04 Special | Airdate: Jun 25, 2010 (90 min)