Scientist

The Scientist is a minor character of Rugrats that appears in the movie Stu, Drew, and Lou were watching in "The Inside Story". He starts out as a supporting protagonist but turns out to be the main antagonist of the movie. He is voiced by Tony Jay.

Description
He is an unnamed scientist who discovers the atom bomb in the President's stomach and claims the only way to get it out is to shrink down with a laser beam and go inside the President's body. After three of the scientists shrink he reveals his true plan is not to remove the device but to detonate it, then he shrinks down. His evil plan is what inspired Angelica to do the same to Chuckie.

Gallery
You can find Scientist gallery here.