Echobrain was an American rock/metal musical group formed in 2000, prominent for featuring bass guitarist Jason Newsted after his departure from Metallica.

[3] The tension created out of Newsted's work in Echobrain ultimately led to his departure from Metallica after over 14 years with the group.

"[4] Newsted responded by pointing out Hetfield's side projects with members of Corrosion of Conformity and his playing and singing on the South Park: Bigger, Longer & Uncut film.

After the performance, they hoped to speak with Newsted in congratulations, but he was nowhere to be found; however, it was revealed in the DVD commentary by Kirk Hammett that he had met with Jason outside of the venue and talked with him there.

In 2002, Echobrain was sued by Dallas–Fort Worth, Texas funk rock band Echo Drain for trademark infringement.