420

"420", also known as "Episode 420", is the twelfth episode of the seventh season of, and the 122nd episode overall. It first aired on April 19, 2009.

Synopsis
"After Brian gets thrown in the slammer for drug possession, he launches a campaign to legalize marijuana. Mayor passes the law, and the whole town goes to pot."

- The Futon Critic

Reception
As a result of the episode, Brian Griffin was named "Stoner of the Year" for 2009 by High Times, a monthly cannabis magazine.