Justin Long on his upcoming animated movies, including Planet 51

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Dec 14, 2012, 3:54 PM EST

Justin Long, who provides the voice of an alien in the upcoming animated family sci-fi movie Planet 51, told reporters that the film hearkens back to the classic E.T.: The Extra-Terrestrial. In the new film, a human astronaut lands on an alien planet where the aliens fear this unknown visitor.

"It's sort of like a reverse E.T." Long said in a group interview on Monday in Beverly Hills, Calif., where he was promoting Drag Me to Hell. "I would, I guess, be the Henry Thomas part. I take in the astronaut."

Dwayne Johnson voices the human, and Long did a comic riff on his co-star's ever-changing name. "Dwayne 'The Rock'—I don't think he's The Rock anymore, though," Long joked. "He's Dwayne Johnson. Just Dwayne, like Cher? Dwayne 'The Johnson' Rock. I worked with The Johnson. He plays the astronaut, and I've heard some of his stuff. It's very funny."

Long also voices a talking animal in the cartoon Alpha and Omega. "That's about wolves," he said. "It's a kids' movie about these two wolves that fall in love."

Finally, Long still provides the voice of Alvin the Chipmunk. The second live-action Alvin and the Chipmunks movie has a title so silly it makes even Long laugh. "The Squeakuel, which is very difficult to say with a straight face," he said.

Planet 51 opens Nov. 20. Alpha and Omega opens in 2010. Alvin and the Chipmunks: The Squeakuel opens Christmas Day.