Cesar Millan's television show Dog Whisperer on National Geographic debuted in 2004, but Millan previously spent years struggling to pursue a career as a dog trainer. Robin Layton/Courtesy of Cesar Millan hide caption

itoggle caption Robin Layton/Courtesy of Cesar Millan

J.G. Quintel is the creator of Regular Show and the voice of one of its main characters, Mordecai. Cartoon Network hide caption

itoggle caption Cartoon Network

Archie Panjabi plays Kalinda Sharma on CBS's The Good Wife. Jeffrey Neira/CBS hide caption

itoggle caption Jeffrey Neira/CBS

Michael Pena as Cesar Chavez Pantelion Films hide caption

itoggle caption Pantelion Films

Over the course of Breaking Bad, Walter White (Bryan Cranston) metamorphosed from a high school chemistry teacher to a notorious outlaw. Ursula Coyote/AMC hide caption

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Matthew Goode (left) as Finn Polmar and Josh Charles (right) as Will Gardner in Sunday night's episode of CBS's The Good Wife. CBS hide caption

itoggle caption CBS

Mike Birbiglia started his career as a server and fill-in comic at a comedy club in college. Charles Sykes/Invision/AP hide caption

itoggle caption Charles Sykes/Invision/AP

Neil deGrasse Tyson is hosting Cosmos, the science documentary series made popular by Carl Sagan. Tyson is Sagan's successor as America's most famous scientist. Richard Shotwell/Richard Shotwell/Invision/AP hide caption

itoggle caption Richard Shotwell/Richard Shotwell/Invision/AP