With “The Lego Movie” set to open solidly this weekend, Warner Bros. has already launched development of a sequel.

The studio has tapped screenwriters Jared Stern and Michelle Morgan to write the script. Stern, who wrote “Mr. Popper’s Penguins,” was one of the half-dozen writers announced a year ago by Warner Bros. as part of its animation consortium aimed at revving up its production of high-end toons.

“The Lego Movie” is the first project to emerge from the consortium. “Lego” is produced by Dan Lin and Roy Lee, with Chris Lord and Phil Miller directing. Providing voices will be Chris Pratt, Will Ferrell, Elizabeth Banks, Liam Neeson, Will Arnett, Nick Offerman, Alison Brie and Morgan Freeman. Most of the animation was being produced by Australia-based Animal Logic.

Morgan wrote the Kristen Wiig comedy “Girl Most Likely.” She’s repped by UTA; Stern is repped by WME.

TheWrap.com first reported Stern writing the sequel.