>>85831759>>85803090There was no Trilogy Plan, that's just something 4chan made up to rationalize how squished the movie seemed to be.
The primary cuts to the movie were a series of monsters along the journey on the Atlantean Highway. This included Squid Bats (flying Jellyfish-like creatures) that'd destroy the submarine which originally survived the Leviathan and you'd actually see them digest their victims in shadow form. Then there were the Lava Whales which made it into Atlantis 2, which were creatures that lived in the lava rivers and were mistaken for hot springs by the crew. Finally, that big bug you see in the montage originally had a full sequence that was Kida's original introduction with Milo stumbling upon them hunting the beast after being separated from the group after the fire fly scene.
Also, original prologue of the film focused on Vikings with the Journal seeking Atlantis out and getting destroyed by the Leviathan, but they went with showing Atlantis's fall to help get you more invested in the city and Kida.