SERN

SERN is a global research organization controlled by the Committee of 300, the central antagonist of the Science Adventure universe. They are the main antagonist faction in Steins Gate and a recurring faction in 0.

Background
Although their main interest is science, they have also taken part in various clandestine operations, such as assassinations and world domination.

SERN also has connections with many mercenary groups worldwide, one such example are the Rounders led by FB.

Through the use of Kerr Black Holes and the Large Hadron Collider, they have been conducting various experiments in time traveling, most notably the attempts at sending living beings (i.e humans) back in time, though their methods were not efficient and the test subjects died in a horrible manner.

Plot
*** Slight Spoiler Alert - Reading the following paragraphs may spoil some of the viewer's enjoyment of the visual novel, manga, and/or anime series.***

SERN is a mysterious organization that holds a prototype time machine. Though near perfection, the organization has yet been able to fully achieve human time travel. The first few episodes allude to the fact that, in the near future, SERN has monopolized the production and use of time machines. SERN discovers the existence of a fully operational time machine belonging to the Future Gadget Lab. They, needless to say, take action.

The plot of the anime adaptation doesn't directly revolve around SERN as the mysterious organization. They only take up the role of antagonists in the later half of the series. SERN is utilized in different ways throughout the series; foreshadowing, suspense, and an element used to quickly change the tone and pace in any given moment.

Trivia

 * SERN was a deliberate misspelling of CERN, an international organization whose purpose is to operate the world's largest particle physics laboratory.
 * SERN's full name is Société Européenne de Recherche Nucléaire (based on the visual novel glossary)