| Name | First Aired | Runtime | Image | |
|---|---|---|---|---|
| S09E01 | I-Spy |
September 9, 2011
BBC Two
|
30 | |
| S09E02 | International |
September 16, 2011
BBC Two
|
30 | |
| S09E03 | Imbroglio |
September 23, 2011
BBC Two
|
30 | |
| S09E04 | Indecision |
September 30, 2011
BBC Two
|
30 | |
| S09E05 | Invertebrates |
October 7, 2011
BBC Two
|
30 | |
| S09E06 | Inventive |
October 14, 2011
BBC Two
|
30 | |
| S09E07 | Incomprehensible |
October 21, 2011
BBC Two
|
30 | |
| S09E08 | Inequality |
October 28, 2011
BBC Two
|
30 | |
| S09E09 | Illness |
November 4, 2011
BBC Two
|
30 | |
| S09E10 | Inland Revenue |
November 11, 2011
BBC Two
|
30 | |
| S09E11 | Infantile |
November 18, 2011
BBC Two
|
30 | |
| S09E12 | Illumination |
November 25, 2011
BBC Two
|
30 | |
| S09E13 | Intelligence |
December 2, 2011
BBC Two
|
30 | |
| S09E14 | Ice |
December 29, 2011
BBC Two
|
30 | |
| S09E15 | Immortal Bard |
April 27, 2012
BBC Two
|
30 | |
| S09E16 |
Idleness
season finale
|
May 4, 2012
BBC Two
|
30 |
No artwork of this type.
No artwork of this type.
No artwork of this type.