Mad Scientist - A German guy who is part of a YouTube show, and he’s a mad s

A German guy who is part of a YouTube show, and he’s a mad scientist who’s also an idiot.

My brother watches that German guy’s YouTube channel and says he’s a mad scientist.

I saw that YouTube guy, Der verrückte Wissenschaftler, and he looks like a mad scientist.

My cousin says he’s a mad scientist because he watches that German guy every day.