Look what's it done to everything else.

该句是典型的口语特征。

look 可以用作及物动词，意思相当于find out。

what's it done  应改为陈述语序：what it has done。

句子应为：

Look what it's done to everything else. =

Look what it has done to everything else.

【翻译】看看它（指：某事物或事件）对其他一切都做了什么（指：造成影响或后果等）。