Play as "Hydraman" (or "The Hydramen"), an extremely vulnerable species with only one great advantage: it is extremely resilient, reproducing rapidly and hibernating for millions of years at a time.

Tour Earth from the Pre-Cambrian past into an apocalyptic future, finding safe hibernation spots until you are jarred awake by major catastrophes (extinction events). Remember that any one given Hydraman is entirely expendable- as long as the species goes on.