Aliens debuting in the year 1901.
1900 <--> 1902
“The Rapha is an elusive predator native to the underground oceans of the Earth's moon, and one...Rapha
“The Tzee is a mysterious predator which inhabits the underground oceans of the Earth's moon. One...Tzee
“The Venusians are a race of sapient six-limbed flying humanoids and the native inhabitants of...Venusian (A Honeymoon in Space)