Welcome Back, Kotter - Full Series Information, Trailer & IMDb Reviews
Watch Welcome Back, Kotter Season 4 Episode 20 online — it may be available on legal streaming platforms such as YouTube, Netflix, Prime Video, Hulu, Disney+, and others.
Welcome Back, Kotter: 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.