Power Rangers Zeo Episode 31 Rock-a-Bye Power Rangers Episode Title:Rock-a-Bye Power Rangers.Episode Description:After two weeks of constant Cog attacks by the Machine Empire, the Zeo Rangers are running ragged, exhausted by both their superhero duties and those of their normal life. Having gotten them to a weakened, sleep-deprived state, King Mondo sends down the Somnibot monster, whose lullaby spell-singing manages to exploit this Achilles heel. Can the Gold Ranger wake them in time? Meanwhile, Bulk & Skull are entrusted with guarding a safe containing a valuable item for one whole day, unaware that a cat burglar has his eye on it.