| Season Episode: 4x01 |
| Episode: 59 |
| Production Number: 3AKY19 |
| Original Air Date: 2008-09-03 |
| Title: Yanks in the U.K. (1) |
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| Season Episode: 4x02 |
| Episode: 60 |
| Production Number: 3AKY20 |
| Original Air Date: 2008-09-03 |
| Title: Yanks in the U.K. (2) |
| |
| Season Episode: 4x03 |
| Episode: 61 |
| Production Number: 3AKY16 |
| Original Air Date: 2008-09-10 |
| Title: Man in the Outhouse |
| |
| Season Episode: 4x04 |
| Episode: 62 |
| Production Number: 3AKY17 |
| Original Air Date: 2008-09-17 |
| Title: The Finger in the Nest |
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| Season Episode: 4x06 |
| Episode: 64 |
| Production Number: 3AKY18 |
| Original Air Date: 2008-10-01 |
| Title: The Crank in the Shaft |
| |
| Season Episode: 4x07 |
| Episode: 65 |
| Production Number: 3AKY21 |
| Original Air Date: 2008-10-08 |
| Title: The He in the She |
| |
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| Season Episode: 4x11 |
| Episode: 69 |
| Production Number: 4AKY05 |
| Original Air Date: 2008-11-26 |
| Title: The Bone That Blew |
| |
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| Season Episode: 4x13 |
| Episode: 71 |
| Production Number: 4AKY07 |
| Original Air Date: 2009-01-22 |
| Title: Fire in the Ice |
| |
| Season Episode: 4x14 |
| Episode: 72 |
| Production Number: 4AKY08 |
| Original Air Date: 2009-02-05 |
| Title: The Hero In the Hold |
| |
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| Season Episode: 4x16 |
| Episode: 74 |
| Production Number: 4AKY10 |
| Original Air Date: 2009-03-12 |
| Title: The Bones That Foam |
| |
| Season Episode: 4x17 |
| Episode: 75 |
| Production Number: 4AKY11 |
| Original Air Date: 2009-03-19 |
| Title: The Salt in the Wounds |
| |
| Season Episode: 4x18 |
| Episode: 76 |
| Production Number: 4AKY12 |
| Original Air Date: 2009-04-02 |
| Title: The Doctor in the Den |
| |
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| Season Episode: 4x21 |
| Episode: 79 |
| Production Number: 4AKY15 |
| Original Air Date: 2009-04-16 |
| Title: The Mayhem on the Cross |
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| Season Episode: 4x23 |
| Episode: 81 |
| Production Number: 4AKY17 |
| Original Air Date: 2009-04-23 |
| Title: The Girl in the Mask |
| |
| Season Episode: 4x24 |
| Episode: 82 |
| Production Number: 4AKY18 |
| Original Air Date: 2009-04-30 |
| Title: The Beaver in the Otter |
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