The scariest greek monster is probably medusa. Hope this helps! :D
cyclops
It was a hydra.
scylla
Cerberus
In Greek Mythology it was referred to as a Minotaur
Medusa is a monster from Greek mythology. If she looks at somebody, she turns them to stone.
Andromeda was rescued from Perseus.
Greek mythology has no chronology in our sense.
the hydra
The monster with a hundred hands, in Greek mythology, was called Hechtonchires.
In Greek mythology a very large humanoid monster is called a GIANT.