Cronus tries to eat Rhea's baby gods because he heard a prophecy that they would overthrow him. Rhea tries to run away.
I need to investigate.
Cronus succeeds at eating the gods and then rests but Rhea poisons him out of anger. He throws up when he wakes up and the gods defeat him.
The spear will be mine!
No, it will be mine!
Poseidon (Bottom left) and his siblings go to Mount Olympus to celebrate with other gods.
Poseidon notices an asteroid coming towards Earth and decides to investigate. Zeus follows Poseidon (Pretend the blue stuff on the Earth is the ground, not water.) (I couldn't find a picture of the Earth without water on it.)
Poseidon and Zeus find the asteroid in a gigantic divot in the ground. They crack open the asteroid and find a spear. Zeus and Poseidon fight over who will take the spear.
Poseidon wins the battle, names the spear the Trident, and strikes the ground with the trident. That causes the ground to shake and a tidal wave of water to fill up the divot.