Definition: In this task, you're given a passage, further information available on a particular linked term from the statement, and an answer term. Your job is to generate a question that can use the information provided to obtain the given answer. You should use the information on both passage and link information to create the question. Note that the answer to the question should be exactly the given answer, and if the answer is none, the answer to the question shouldn't be obtainable from the passage or linked information.
Input: Passage: "Episode 420" is the 12th episode in the seventh season of the American animated television series Family Guy. It premiered on Fox in the United States on April 19, 2009. The title of the episode is a reference to the term "420" used in cannabis culture; "Episode 420" premiered on bicycle day, April, 19th, the day before April 20 (4/20), on which a counterculture holiday is celebrated centering on the consumption of cannabis. "420" focuses on the character Brian after he is arrested for drug possession, which prompts him to launch a campaign to legalize cannabis with help from Stewie; the liveliness of their campaign convinces Mayor West to legalize the drug, and most of Quahog's population begins using it.
Link Information: Family Guy is an American animated sitcom television series created by Seth MacFarlane for the Fox Broadcasting Company. The series centers on the Griffins, a family consisting of parents Peter and Lois; their children, Meg, Chris, and Stewie; and their anthropomorphic pet dog, Brian. The show is set in the fictional city of Quahog, Rhode Island, and exhibits much of its surreal & dark humor in the form of metafictional cutaway gags that often lampoon American culture.

The family was conceived by MacFarlane after developing two animated films, The Life of Larry and Larry & Steve. MacFarlane redesigned the films' protagonist, Larry, and his dog, Steve, and renamed them Peter and Brian, respectively. MacFarlane pitched a seven-minute pilot to Fox in 1998, and the show was greenlit and began production. Answer: 1998
Output:
When was the series of Episode 420 started?