I had this idea for a while. This was inspired by Link and the Hero's Shade in "Legend of Zelda: Twilight Princess" where the Hero's Shade is the spirit of what many people say is the Ocarina of Time incarnation of Link, but I believe it's actually the Skyward Sword incarnation.
So anyway, here is Spike meeting up with the spirit of his ancestor who is, you guessed it, the spirit of the Spike from the original MLP series. Who's voice I find now kind of annoying. The current Spike's voice is perfect. I don't know how many other bronies have seen the original MLP series before FIM existed, but I did actually find the original series kind of cool...back then. But now, it seems childish. I know the current series was intended for children too, but it's more mature. The older series just seems like it was made for younger kids while I see the current version to be more directed towards an audience of all ages. But I will tell you I only saw the original series and even the 3rd series just cause my younger sister got some of the VHS videos. And they both were OK back then, but not good now. So in other words, the G1 Spike was too young, the G3 Spike was too old, but the current Spike is just the right age.