The Call of the Simpsons episode, along with his four other appearances on "The Simpsons", the best guest appearance in the show's history. "The Call of the Simpsons" received mixed reviews from critics. Warren Martyn and Adrian Wood, the authors of the book "I Can't Believe It's a Bigger and Better Updated Unofficial Simpsons Guide", both criticized and praised the episode saying: "This episode is a bit less than the sum of its parts. The early stuff at the RV Round-Up is much better than the main camping story, although there's some nice Marge-Lisa bonding, and who could resist Maggie and the bears?" In a
The Simpsons 2007, "The Simpsons" reached their 400th episode at the end of the eighteenth season. While "The Simpsons" has the record for the number of episodes by an American animated show, other animated series have surpassed "The Simpsons". For example, the Japanese anime series "Sazae-san" has over 7,000 episodes to its credit. In 2009, Fox began a year-long celebration of the show titled "Best. 20 Years. Ever." to celebrate the 20th anniversary of the premiere of "The Simpsons". One of the first parts of the celebration is the "Unleash Your Yellow" contest in which entrants must design a poster for the