Charlie Hunnan co-stars in Guillermo del Toro sci-fi pic

EXCLUSIVE: Charlie Day in talks to join the cast for Legendary Pictures’ “Pacific Rim” that Guillermo del Toro is on board to direct.

The pic, which already stars “Sons of Anarchy” star Charlie Hunnan, is about an alien invasion that threatens earth and the humans who come together to defend it.

Day will play a professor. Legendary had no comment on the casting.

Travis Beacham penned the script and Legendary’s Thomas Tull will produce along with Jon Jashni.

Production is expected to get under way this fall.

The project has gained momentum in recent months since del Toro came on board to direct after his previous pic “At the Mountains of Madness” was put into turnaround at Universal.

Legendary is looking at the project as a potential tentpole, targeting rising talent.

Legendary had shown strong interest in Ildris Elba to take a role, and at one point Alexander Skarsgard was being pursued. Skarsgard passed because of his “True Blood” commitments.

Day can be seen next in New Line’s “Horrible Bosses.”

Day is repped by WME and 3 Arts.

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