I thought it was really cool how Sesame Street integrated R2-D2 and C-3PO into its formula of learning. 

Specials

Season 1

Season 2

Season 3

Season 4

Season 5

Season 6

Season 7

Season 8

Season 9

Season 10

Season 11

Season 12

Season 13

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Season 15

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Season 18

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Season 25

Season 26

Season 27

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Season 31

Season 32

Season 33

Season 34

Season 35

Season 36

Season 37

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Season 40

Season 41

Season 42

Season 43

Season 44

Season 45

Season 46

Season 47

Season 48

Season 49

Season 50

Season 51

Season 52

Season 53

Season 54

Season 55