Kevin Sorbo makes a guest appearance in his familiar role as legendary muscleman Hercules. Teaming up with old friends Xena (Lucy Lawless) and Gabrielle (Renee O'Connor), Hercules tries to prevent Zeus (Charles Keating) from killing Xena's unborn child -- a move borne of Zeus' fear that the baby will fulfill the prophecy that the Olympian gods will be destroyed by "a child not begotten of man." Meanwhile, Xena heads down to the Underworld in search of the Helmet of Invisibility -- and in the course of her nether travels, she is reunited with her deceased son, Solan (Nicko Vella). ~ Hal Erickson, Rovi