Hiro tried, but failed, to save Charlie. Guess time traveling can't fix everything. The latter character will return for one episode in season four, however.
We are not the pinnacle of so-called evolution. That honor belongs to the lowly cockroach. Capable of living for months without food. Remaining alive headless for weeks at a time. Resistant to radiation. If God has indeed created Himself in His own image, then I submit to you that God is a cockroach.
This quest. This need to solve life's mysteries. In the end, what does it matter when the human heart can only find meaning in the smallest of moments? They're here. Among us. In the shadows. In the light. Everywhere. Do they even know yet?