In Beasts of the fifth sun, the Doc and Drew were talking about a tentacled creature in Weird World that was attacking them when Zak entered. Komodo, Zon and Fiskerton escaped and helped Zak. It's possible it's the nameless thing of Berkely Square, that was agressive. Drew will later emntion being covered in goo, and it's possible it was living at the goo, and the nameless thing is terrestrial, so it's probably, the goo being not deep, the Oklahoma Octopus or the Devil's lake Monster.