Carlos Saldanha Director Ray Romano Manny Voice Denis Leary Diego Voice John Leguizamo Sid Voice Queen Latifah Ellie Voice Seann William Scott Crash Voice Chris Wedge Scrat Voice, Executive Producer Simon Pegg Buck Voice Josh Peck Eddie Voice Bill Hader Gazelle Voice Kristen Wiig Pudgy Beaver Mom Voice Jane Lynch Diatryma Mom Voice Clea Lewis Start Mom Voice Cindy Slattery Bird Voice Karen Disher Scratte Voice Eunice Cho Madison Actor Harrison Fahn Glypto Boy Actor Mike Thurmeier Co-Director Michael Berg Screenwriter Peter Ackerman Screenwriter Mike Reiss Screenwriter Yoni Brenner Screenwriter John C. Donkin Producer Lori Forte Producer Harry Hitner Film Editing John Powell Original Music Mike Knapp Art Director Melanie Martini Set Decoration Kyle Smith Set Decoration Christian Kaplan Casting