Hot on the heels of their recent Earth Day appearance on "Oprah", the people behind the Oscar-winning documentary "The Cove" have released a new dolphin PSA featuring plenty of recognizable Hollywood talent.

Jennifer Aniston, Hayden Panettiere, Courtney Cox, James Gandolfini, Evan Handler, Mariska Hargitay, Woody Harrelson, Carrie Ann Inaba, Richard Kind, James Kyson Lee, John Leguizamo, Fisher Stevens, Rob Morrow, Jason Mraz, Paul Rudd, Russell Simmons, Ben Stiller, Chris Tashima, Tamlyn Tomita, Naomi Watts and Robin Williams each make an appearance.

The goal of the campaign is to urge people to visit to write leaders such as President Obama, Vice President Joe Biden and Japanese authorities to ask for slaughter practices to be changed. To learn more, visit the campaign site here.