The Gathering Part II is good but if I'd seen that one first I probably would not have looked for Part I.
Originally, there was a plan to make a series from the storyline in Part I but after Part II fell a bit flat, they moved on.
Part I is one of my favorites both because it shows New England in the 70's as well as the performances of Ed Asner and Maureen Stapleton. The rest of the cast is also very good. If you've never seen it, it is well worth a watch!!!