Despite what Loki may say in the trailer, the Time-Keepers are not actually "space lizards." They are, however, semi-humanoid beings created by the last director of the Time Variance Authority at the literal end of time. Oddly enough, Loki's brother Thor was instrumental in the trio's creation by intervening and splitting the reality of their precursors, the Time-Twisters, in two. To ensure their survival and domination over the other, both the Time-Keepers and the Time-Twisters continuously manipulate events in the multiverse. Of course, all of the above has to do with the Time-Keepers' role in the comics. However, it's safe to say that the Time-Keepers are still the watchers of time and have a vested interest in keeping the "sacred timeline" intact, so long as it ensures their prosperity.
