Maybe I should clarify . . . I'm semi-proficient with other areas of Maya, and I've done a number of animations in the past. I've just never used anything like this "pre-fabricated" explosion.

So if I have a key frame in frame 137, and that's where I want the opacity to be set to 0, where can I access that node and change the opacity in that key frame, rather than in the entire object's attributes . . .

Am I making sense? Ugh. Hate being new at this.