Family guy Jack Sadelstein prepares for the annual event he dreads: the Thanksgiving visit of his twin sister, the needy and passive-aggressive Jill, who then refuses to leave.
Theseus is a mortal man chosen by Zeus to lead the fight against the ruthless King Hyperion, who is on a rampage across Greece to obtain a weapon that can destroy humanity.
Mumble's son, Erik, is struggling to realize his talents in the Emperor Penguin world. Meanwhile, Mumble and his family and friends discover a new threat their home -- one that will take everyone working together to save them.