What is the informal way of saying, “a whole different animal”?

The informal way of saying, “a whole different animal” is:

Based on the context through which the phrase “a whole different animal”  was used, we can see that it shows that it can be used informally to show that it was an entirely new category.

When this is used in a sentence, we can see that it means the same thing but only in a loose way that is not official or formal and is not considered appropriate in formal settings.

Read more about informal speech here:

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In fact, the phrase "a whole different animal" can be used idiomatically to mean "another category altogether." Here's an example where an airline is using the phrase to promote itself in a positive light: Let's face it. Air travel is a pretty straightforward business.

Explanation:

the answer is emerged from.

orpheus descended to hades, the world of the death to rescue eurydice. no mortal had ever done this before him, he survived because he was protected by the gods. the word "underworld" gives us a clue, he emerged from it like a whale emerges form sea for exemple.

fears about being blown up