Scrat is still trying to nab the ever-elusive nut and in the process may find his true love; Manny and Ellie await the birth of their mini-mammoth; Diego, the saber-toothed tiger, wonders if he's growing too 'soft' hanging with his pals; and Sid the sloth gets into trouble when he creates his own makeshift family by hijacking some dinosaur eggs. On a mission to rescue the hapless Sid, the gang ventures into a mysterious underground world where they...

Josh has a major problem -- besides the fact he's in college in Ithaca, NY, and his longtime girlfriend Tiffany is in Austin, TX. A video of him getting funky with the luscious Beth was mistakenly mailed to Tiffany and now he has three days to get to Texas before the tape does!