Welcome Back, Kotter Season 4 Episode 20
Oo, Oo, I Do (1)
Arnold's relationship with Mary gets serious. Then he finds out he has to move and leave the school. Upset, Arnold decides to propose marriage to Mary. She accepts.
4 - 23The BreadwinnersJun. 08, 1979- 4 - 22I'm Okay, But You're NotJun. 01, 1979
- 4 - 21Oo, Oo, I Do (2)May. 25, 1979
- 4 - 20Oo, Oo, I Do (1)May. 25, 1979
- 4 - 19The Gang ShowMar. 17, 1979
- 4 - 18The Sweat Smell of SuccessMar. 03, 1979
- 4 - 17Come Back, Little ArnoldFeb. 24, 1979
- 4 - 16The Goodbye GuyFeb. 10, 1979
- 4 - 15Barbarino's BabyFeb. 03, 1979
- 4 - 14Bride and GloomJan. 13, 1979
- 4 - 13A Winter's Coat TailDec. 16, 1978
- 4 - 12A Little Fright MusicDec. 02, 1978
- 4 - 11Frog Day AfternoonOct. 09, 1978
- 4 - 10Washington's CloneNov. 11, 1978
- 4 - 9The Barbarino BluesNov. 04, 1978
- 4 - 8X-Rated EducationOct. 28, 1978
- 4 - 7Barbarino's Boo-BooOct. 21, 1978
- 4 - 6The SweatmobileSep. 11, 1978
- 4 - 5Once Upon a LedgeOct. 02, 1978
- 4 - 4Don't Come Up and See Me SometimeSep. 11, 1978
- 4 - 3Beau's JestSep. 25, 1978
- 4 - 2The Drop-Ins (2)Sep. 18, 1978
- 4 - 1The Drop-Ins (1)Nov. 25, 1978
