剧情先容；一个意外事件让多莉隐约记起了自己曾经也拥有过的家人和朋友。于是，她整理好自己的感情，把自己想去寻回昔日的自己和故人的想法见告了马林父子。马林父子表示很理解多莉的想法，也乐意陪伴她一起找寻影象中的人和故事。于是，他们一行人再度踏上了那片浩瀚无边的大海，开始了一场探求多莉过去的旅程。茫茫大海中，健忘的多莉想要寻回昔日影象谈何随意马虎？终极，他们能否如愿见到多莉过去的家人和朋友？在这片望不见边缘的大海中，几位小勇士又将遭遇若何不可预知的惊险事宜呢？
海底总动员2影片主题曲：Unforgettable - Sia
《Unforgettable》歌词：
Unforgettable that's what you are
Unforgettable tho near or far
Like a song of love that clings to me
How the thought of you does things to me
Never before
Has someone been more
Unforgettable in every way
And forevermore that's how you'll stay
That's why darling it's incredible
That's someone so unforgettable
Thinks that I am unforgettable too
Unforgettable in every way oh oh oh
That someone so unforgettable
Thinks that I am unforgettable too
海底总动员2影片插曲：Beyond The Sea - Bobby Darin
《Beyond the Sea》歌词：
Somewhere beyond the sea
Somewhere waitin' for me
My lover stands on golden sands
And watches the ships that go sailin'
Somewhere beyond the sea
She's there watchin' for me
If I could fly like birds on high
Then straight to her arms I'd go sailin'
It's far beyond the stars
It's near beyond the moon
I know beyond a doubt
My heart will lead me there soon
We'll meet beyond the shore
We'll kiss just as before
Happy we'll be beyond the sea
And never again I'll go sailin'
We'll meet, I know we'll meet, beyond the shore
No more sailin', so long sailin'
Bye, bye sailin'
Move on out, captain
