While seeking a new spot to hide his precious acorn, Scrat hops across a frozen landscap before noticing a strange green glow coming from below an ice patch. Digging down, he uncovers a time machine. It is revealed in a wider shot, that a scientist appeared to have travelled back in time and gotten frozen in the ice.
Unsure just what the strange glowing thing is, Scrat touches it, activating the machine, which zaps the acorn to another time plane. Scrat reacts to this and starts beating up on the machine, which transports him to a medieval period, where he manages to regain the acorn, but not before being fired upon with multiple arrows and out of a cannon.
The machine next takes him to ancient Rome. Having landed in the famed Coliseum, Scrat contends with a chariot and an unseen animal before time-travelling again.
His next location takes him to a snow and icey location. Scrat thinks he's finally home, until it is revealed that he has been transported to the iceberg that the 'Titanic' strikes.
His next location takes him back to a period of time from the 1st 'Ice Age' movie, where Scrat tussles with himself over his acorn, before the machine zaps it off to some other time zone.
Scrat then goes after the nut once again, ending under the engines of a spaceship before takeoff, a jewelry store, a girl's locker room, a guillotine, under Benjamin Franklin's kite, a bulding demolition, an atomic explosion, on the rails of a train track, and then in front of the statue of Michelangelo's 'David.'
Finally, Scrat is caught in an unknown time frame and finally grabs the nut before getting sucked into a vortex. When he comes to, he sees a large tree that is teaming with acorns! As he tosses aside his single acorn, it activates the time machine again. Fearing to lose out on his latest bounty, Scrat smashes the time machine, and then runs to the tree...only to find that it is not real, and finds that it is a memorial, as in the future, acorns are no more.
Realizing he still has his own acorn, Scrat runs back for it, only to have the time machine exert one last little burst of energy, zapping the nut away before finally falling apart. Frustrated once again, Scrat screams in anger at his predicament.