| Season Episode: 4x01 |
| Episode: 152 |
| Production Number: |
| Original Air Date: 2008-05-02 |
| Title: May 2, 2008 |
|  |
| Season Episode: 4x02 |
| Episode: 153 |
| Production Number: |
| Original Air Date: 2008-05-09 |
| Title: May 9, 2008 |
| |
| Season Episode: 4x03 |
| Episode: 154 |
| Production Number: |
| Original Air Date: 2008-05-16 |
| Title: May 16, 2008 |
| |
| Season Episode: 4x04 |
| Episode: 155 |
| Production Number: |
| Original Air Date: 2008-05-23 |
| Title: May 23, 2008 |
| |
| Season Episode: 4x05 |
| Episode: 156 |
| Production Number: |
| Original Air Date: 2008-05-30 |
| Title: May 30, 2008 |
| |
| Season Episode: 4x06 |
| Episode: 157 |
| Production Number: |
| Original Air Date: 2008-06-06 |
| Title: June 6, 2008 |
| |
| Season Episode: 4x07 |
| Episode: 158 |
| Production Number: |
| Original Air Date: 2008-06-13 |
| Title: June 13, 2008 |
| |
| Season Episode: 4x08 |
| Episode: 159 |
| Production Number: |
| Original Air Date: 2008-06-20 |
| Title: June 20, 2008 |
| |
| Season Episode: 4x09 |
| Episode: 160 |
| Production Number: |
| Original Air Date: 2008-06-27 |
| Title: June 27, 2008 |
| |
| Season Episode: 4x10 |
| Episode: 161 |
| Production Number: |
| Original Air Date: 2008-07-04 |
| Title: July 4, 2008 |
| |
| Season Episode: 4x11 |
| Episode: 162 |
| Production Number: |
| Original Air Date: 2008-07-11 |
| Title: July 11, 2008 |
| |
| Season Episode: 4x12 |
| Episode: 163 |
| Production Number: |
| Original Air Date: 2008-07-18 |
| Title: July 18, 2008 |
| |
| Season Episode: 4x13 |
| Episode: 164 |
| Production Number: |
| Original Air Date: 2008-07-25 |
| Title: July 25, 2008 |
| |
| Season Episode: 4x14 |
| Episode: 165 |
| Production Number: |
| Original Air Date: 2008-08-01 |
| Title: August 1, 2008 |
| |
| Season Episode: 4x15 |
| Episode: 166 |
| Production Number: |
| Original Air Date: 2008-08-08 |
| Title: August 8, 2008 |
| |
| Season Episode: 4x16 |
| Episode: 167 |
| Production Number: |
| Original Air Date: 2008-08-15 |
| Title: August 15, 2008 |
| |
| Season Episode: 4x17 |
| Episode: 168 |
| Production Number: |
| Original Air Date: 2008-08-22 |
| Title: August 22, 2008 |
| |
| Season Episode: 4x18 |
| Episode: 169 |
| Production Number: |
| Original Air Date: 2008-08-29 |
| Title: August 29, 2008 |
| |
| Season Episode: 4x19 |
| Episode: 170 |
| Production Number: |
| Original Air Date: 2008-09-05 |
| Title: September 5, 2008 |
| |
| Season Episode: 4x20 |
| Episode: 171 |
| Production Number: |
| Original Air Date: 2008-09-12 |
| Title: September 12, 2008 |
| |
| Season Episode: 4x21 |
| Episode: 172 |
| Production Number: |
| Original Air Date: 2008-09-19 |
| Title: September 19, 2008 |
| |
| Season Episode: 4x22 |
| Episode: 173 |
| Production Number: |
| Original Air Date: 2008-09-26 |
| Title: September 26, 2008 |
| |
| Season Episode: 4x23 |
| Episode: 174 |
| Production Number: |
| Original Air Date: 2008-10-03 |
| Title: October 3, 2008 |
| |
| Season Episode: 4x24 |
| Episode: 175 |
| Production Number: |
| Original Air Date: 2008-10-10 |
| Title: October 10, 2008 |
| |
| Season Episode: 4x25 |
| Episode: 176 |
| Production Number: |
| Original Air Date: 2008-10-17 |
| Title: October 17, 2008 |
| |
| Season Episode: 4x26 |
| Episode: 177 |
| Production Number: |
| Original Air Date: 2008-10-24 |
| Title: October 24, 2008 |
| |
| Season Episode: 4x27 |
| Episode: 178 |
| Production Number: |
| Original Air Date: 2008-10-31 |
| Title: October 31, 2008 |
| |
| Season Episode: 4x28 |
| Episode: 179 |
| Production Number: |
| Original Air Date: 2008-11-07 |
| Title: November 7, 2008 |
| |
| Season Episode: 4x29 |
| Episode: 180 |
| Production Number: |
| Original Air Date: 2008-11-14 |
| Title: November 14, 2008 |
| |
| Season Episode: 4x30 |
| Episode: 181 |
| Production Number: |
| Original Air Date: 2008-11-21 |
| Title: November 21, 2008 |
| |
| Season Episode: 4x31 |
| Episode: 182 |
| Production Number: |
| Original Air Date: 2008-11-28 |
| Title: November 28, 2008 |
| |
| Season Episode: 4x32 |
| Episode: 183 |
| Production Number: |
| Original Air Date: 2008-12-05 |
| Title: December 5, 2008 |
| |
| Season Episode: 4x33 |
| Episode: 184 |
| Production Number: |
| Original Air Date: 2008-12-19 |
| Title: December 19, 2008 |
| |
| |
| Season Episode: 4x35 |
| Episode: 186 |
| Production Number: |
| Original Air Date: 2009-01-02 |
| Title: January 2, 2009 |
| |
| Season Episode: 4x36 |
| Episode: 187 |
| Production Number: |
| Original Air Date: 2009-01-09 |
| Title: January 9, 2009 |
| |
| Season Episode: 4x37 |
| Episode: 188 |
| Production Number: |
| Original Air Date: 2009-01-16 |
| Title: January 16, 2009 |
| |
| Season Episode: 4x38 |
| Episode: 189 |
| Production Number: |
| Original Air Date: 2009-01-23 |
| Title: January 23, 2009 |
| |
| Season Episode: 4x39 |
| Episode: 190 |
| Production Number: |
| Original Air Date: 2009-01-30 |
| Title: January 30, 2009 |
| |
| Season Episode: 4x40 |
| Episode: 191 |
| Production Number: |
| Original Air Date: 2009-02-06 |
| Title: February 6, 2009 |
| |
| Season Episode: 4x41 |
| Episode: 192 |
| Production Number: |
| Original Air Date: 2009-02-13 |
| Title: February 13, 2009 |
| |
| Season Episode: 4x42 |
| Episode: 193 |
| Production Number: |
| Original Air Date: 2009-02-20 |
| Title: February 20, 2009 |
| |
| Season Episode: 4x43 |
| Episode: 194 |
| Production Number: |
| Original Air Date: 2009-02-27 |
| Title: February 27, 2009 |
| |
| Season Episode: 4x44 |
| Episode: 195 |
| Production Number: |
| Original Air Date: 2009-03-06 |
| Title: March 6, 2009 |
| |
| Season Episode: 4x45 |
| Episode: 196 |
| Production Number: |
| Original Air Date: 2009-03-13 |
| Title: March 13, 2009 |
| |
| Season Episode: 4x46 |
| Episode: 197 |
| Production Number: |
| Original Air Date: 2009-03-20 |
| Title: March 20, 2009 |
| |
| Season Episode: 4x47 |
| Episode: 198 |
| Production Number: |
| Original Air Date: 2009-03-27 |
| Title: March 27, 2009 |
| |
| Season Episode: 4x48 |
| Episode: 199 |
| Production Number: |
| Original Air Date: 2009-04-03 |
| Title: April 3, 2009 |
| |
| Season Episode: 4x49 |
| Episode: 200 |
| Production Number: |
| Original Air Date: 2009-04-10 |
| Title: April 10, 2009 |
| |
| Season Episode: 4x50 |
| Episode: 201 |
| Production Number: |
| Original Air Date: 2009-04-17 |
| Title: April 17, 2009 |
| |
| Season Episode: 4x51 |
| Episode: 202 |
| Production Number: |
| Original Air Date: 2009-04-24 |
| Title: April 24, 2009 |
| |
| Season Episode: 4x52 |
| Episode: 203 |
| Production Number: |
| Original Air Date: 2009-05-01 |
| Title: May 1, 2009 |
| |
