While Continental Drift and A Mammoth Christmas are two distinct projects with different directors, the voice cast recorded their dialogue for both simultaneously. Romano explained, "When I would go in for a recording session for the new movie like the first hour or so would be for the special. For a couple of recording sessions we piggybacked them together."
In the very first film, Romano's character, Manny, was thought to be the last of his kind, with woolly mammoths on their way to extinction. In the first sequel, Ice Age: The Meltdown, Manny and his friends discovered another woolly mammoth, Ellie, voiced by Queen Latifah. The second sequel, Ice Age: Rise of the Dinosaurs, had Manny and Ellie expecting their first baby mammoth, and in the Christmas special, their daughter Peaches is voiced by Ciara Bravo.
In the upcoming fourth film, however, Peaches has grown up considerably and is voiced by Keke Palmer. The changing family dynamics are key to the story of Continental Drift, according to Romano. "The new movie more is about the daughter that we have, Peaches, now is a
teenager. It's kind of about that, about Manny dealing with a teenage
daughter."
"You know, there is so much crazy stuff that goes on," he explained. "But
underlying it all is just the plight of the families and friends and
all the trials and tribulations of being a family and a parent. That's
what this one is. It's her trying to go out on her own and have a
boyfriend and this, and that, and Manny has to learn to let go. But
there's a great adventure which moves the story."
Even Romano has been surprised to find that the first film led to such a robust franchise. Still, fans of the series are happy for more, and there are plenty of stories to tell. Romano said, "After we did the third I said, 'Wow, this is a great franchise but it's three and out, isn't it?' And sure enough the fans just wouldn't let it go. I knew that if they came up with an interesting story–it's good, it's great. But you also want to make sure you're not overdoing it. You're not overstaying it. But I really enjoyed this last one we did. Again, they have other stories to tell. The baby is now a teenager and it's a whole other set of circumstances."
After a decade of providing vocal life to his animated alter ego, the actor finds it quite easy to slide into character by now. "It takes a couple of minutes when I get into the recording studio," he said. "I have a line that I use as my mantra, my way in. And it's a line from the first movie were Sid is trying to get him to go somewhere and he just gets into Sid's face and he says, 'I'm not going.' So I repeat that about a dozen times until I feel it. And the thing is, when people hear the movie they think that that's just me doing my voice and it's not. I'm tweaking my voice. It's Manny. I can distinguish between my normal speaking voice and Manny. I am doing the character. And yes, at this point, it's as simple as that. It's just repeating that line over and over again."

Ice Age: A Mammoth Christmas is in stores now for the holiday season, while Ice Age: Continental Drift – featuring the voices of Romano, Leguizamo, Leary, and Latifah, along with Josh Peck, Seann William Scott, Jennifer Lopez, Josh Gad, Aziz Ansari, J.B. Smoove, and Alan Tudyk – arrives in theaters on July 13, 2012.
