The 'welcome back kotter sweatside story' might be a specific narrative within the 'Welcome Back, Kotter' universe. Since the show focused on the relationship between the teacher and the students, it could be a story that takes place on the side of the main plot, perhaps something involving the Sweathogs' extracurricular activities or their personal lives outside of the classroom. However, without more context, it's hard to be certain.
One welcome back to school story could be about a new student who was really nervous on the first day. But a kind teacher noticed and introduced them to a friendly group. They quickly became friends and the new student felt much more at ease. It shows how a little kindness can make a big difference in the school environment.
It could be a familiar character's return or a new plot twist that brings excitement. Maybe it's a reunion of beloved heroes or a resolution to a long-standing conflict.
The back story of Alice in Twilight might encompass her encounters with supernatural elements, her motivations for being in that particular setting, and how it all ties into her present situation.