Titan's species
From Tardis Wiki, the free Doctor Who reference
According to a document based upon Brent Cleever's Compact Dicta~File, Titan was the last survivor of an underwater race, with the species having been wiped out by chemical waste dumped from ships in the late 20th century, leading Titan to swear vengeance.
In an account dated to the 2080s, Titan was 230 Marine Years old in 2089. (PROSE: Rogues Gallery [+]Loading...["Rogues Gallery (short story)"])