Series 4, Episode 1 (S4E1)
4/17/1980
Series 4, Episode 2 (S4E2)
4/24/1980
Series 4, Episode 3 (S4E3)
5/1/1980
Series 4, Episode 4 (S4E4)
5/8/1980
Series 4, Episode 5 (S4E5)
5/15/1980
Series 4, Episode 6 (S4E6)
5/22/1980
Series 4, Final (S4E7)
5/29/1980
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