Marlin was excited about having a family and was waiting for the eggs to hatch; Nemo was anxious to finally go to school; Marlin was very protective and was afraid to let go of him.
Meeting the Mentor
Hey buddy, why do you keep following me?!
Nemo went to touch the "Butt" of the boat to prove he was brave.
Crossing the Threshold
Marlin was afraid to go after Nemo since he was scared of the open sea
Test, Allies, Enemies
When Marlin chases after the boat that took Nemo, he runs into a fish named Dory who has short term memory. Throughout their journey, she teaches him to not be afraid and to believe that Nemo will be okay without him.
Marlin continues his journey with Dory by his side and continues trying to find his son even in the big open sea. Nemo learns that he'll be in a fish tank in a dentist's office.
Marlin and Dory escape vegetarian sharks, being attacked by an Angler fish, they get directions from a school of fish, they survive getting through jellyfish, and receive help from sea turtles. Nemo also makes friends and learn about a fish-killing girl name Darla.