Frank "the Pug" is a Remoolian that lives on planet Earth disguised as a Pug. He works for the Men In Black, a secret agency that monitors all extraterrestrial activity on Earth. In the first MIB movie, Frank is an informant who gives Agents K and J information about the miniature galaxy that is hidden somewhere on Earth and that is wanted by the Arquillians and the Bugs; two alien races that had declared war against each other. The reason is that each faction wants the galaxy for itself is that it is a powerful energy source. In the second movie, Frank becomes Agent J's new partner. After Agent K comes back, Frank becomes Zed's new assistant.