Past Tense is the story of Adam, one of the First Men, a race of Life Seeders. Originally sent to Earth to seed it with life in the primordial phase of its existence, the First Men abandoned Adam there and departed.
Immortal, god-like, and really pissed off, Adam must now wait for life to evolve high enough for him to secure a ship to leave Earth and find his fellow First Men. Revenge is sweet.
The story of Past Tense flips between events in the past, and the events unfolding now. With a rich history of human triumphs and tragedies, it's a sure bet Adam had a hand in all of them. When you're immortal, you get bored easily.
It's a good thing there is plenty of scotch and cigarettes.