On this enterprise there are stars who’re simple to trace down and others who show to be far more difficult. Discovering Gabe Kaplan, the sensible creator and star of the hit comedy sequence Welcome Again, Kotter began early this yr through numerous calls and e-mail requests. Clearly, we have been seeking to discuss to the comedy genius about Welcome Again, Kotter’s fiftieth anniversary and the comedy’s enduring legacy, because the sequence first debuted on Sept. 9, 1975.