Comic-Con 2013: 'The Simpsons' and 'Futurama' crossover is happening

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It may be hard to believe, but "The Simpsons" is going into it's 25th year on the air. To celebrate, the creator, producers and writers arrived at Comic-Con 2013 to have a good time with the fans.

The panel starts with a sneak peak at the 2013 "Treehouse of Horror" intro, directed by Guillermo Del Toro, which includes homages to nearly any thriller or horror movie or book you could think of. Everything from zombies, to Stephen King, to even Cthulhu gets a little tribute. There's even a moment of Lisa in "Alice in Wonderland" and an appearance by "Futurama's" Hypnotoad.

The Hypnotoad was also used as an introduction to announce a full crossover happening between "The Simpsons" and Futurama. The casts will record the episode in August and it will be used as either the season 25 finale of season 26 premiere of "The Simpsons." The crossover was alluded to in the "Futurama" panel that preceded "The Simpsons.".

Additionally, a slew of guest stars were announced for season 25. Among the names that will appear in Springfield ate Zach Galifianakis, Kristen Wiig, Elizabeth Moss, Stan Lee and Rachel Maddow. Sounds like a lot of exciting things are on tap for the upcoming season.

Next, creator Matt Groening introduces musical group "We Put the Spring in Springfield," a "Simpsons" cover band. That's right, they performed a medley of songs that have appeared in the show, from the Mr. Plot jingle to the Flaming Moe's theme.

The second clip is from the episode guest-starring Moss. Homer helps her character delver a baby in an elevator. She names the baby Homer Jr. in tribute, which Marge isn't too excited about.

Groening and executive producer Al Jean also talked about the "Simpsons: Tapped Out" game. They say the game's script is written by the writer's on the show and will continue to work hand-in-hand with episodes of the series.

When asked about the :South Park episode "The Simpsons Did It First," Jean says they love the episode and are now finding fans who are saying the same thing about "Under the Dome," as a huge glass dome was over Springfield was a plot point in "The Simpsons Movie."

The panel wraps with another performance by "We Put the Spring in Springfield."
Photo/Video credit: FOX