Icon-zeo.pngThis article is about a/an episode in Power Rangers Zeo, the second season in the Zordon Era.

Rock-a-Bye Power Rangers is the thirty-first episode of Power Rangers Zeo. It is the fourth episode of the Gold Ranger arc.


The Machine Empire has been wearing down the Zeo Rangers for two weeks with constant Cog attacks. The Rangers get incredibly sleepy despite the help from the Gold Ranger.

Mondo capitalizes on the situation by ordering Klank and Orbus to create a monster that can put people and machines to sleep so they can finally be rid of the Rangers once and for all. They succeed in creating one called Somnibot, a singing robot that can put people and machines to sleep with her lullabies. Unfortunately, her melodious singing even makes her tired too. She is sent to Earth to carry out this mission.

Meanwhile in the subplot,, Bulk and Skull get a case from their boss protecting a client's safe, and must remain alert and awake because a burglar plans on stealing the safe. The Rangers and Alpha 5 also begin to suspect that Billy is the Gold Ranger due to his constant disappearances.


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"Ay-yi-yi, this place is a disaster!"

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The episode begins with the Zeo Rangers fighting several Cogs in Angel Grove Park. The Gold Ranger shows up, causing the Cogs to disappear. The Rangers discuss the matter before trudging back to the Power Chamber. The Machine King and Queen see the Rangers' tiredness, and Mondo says that this advantage calls for a new monster.

At the Youth Center, the teens discuss what has been happening to them, with Rocky saying that between school, chores, fighting monsters and homework, they haven't slept well in weeks.

Meanwhile, at the detective agency, Stone informs Bulk and Skull that their latest client, an old woman named Mrs. Hufford, has entrusted them to protect her valuables for the next day. Bulk and Skull promise not to sleep on the job, while a burglar listens in from outside the entry door.

Back at the Machine Palace, Klank and Orbus introduce the royal family to Somnibot, a monster that uses her voice to put people and machines into a deep, peaceful sleep with a cradle song. Mondo, impressed at the monster's abilities despite her having not demonstrated them just yet, orders Klank to ask a Quadrafighter pilot to take Somnibot to Earth so she can use her abilities.

While flying on the back of a Quadrafighter, Somnibot practices her song, which causes the pilot to almost fall asleep. After she wakes it back up, she puts several Angel Grove citizens to sleep in the park with her song, which we find out is "Rock-a-Bye Baby". The Rangers are individually called to the Chamber by Zordon and Alpha, who inform them on Somnibot and her special powers - she uses harmonics and music to place her victims—human or robot—under a powerful sleeping spell; however, her delta wave frequency can be altered or terminated to wake up her victims, as their sleep is induced by transmission like Beamcaster's spell rather than legitimate sleep. Rocky muses that Somnibot's spell seems like a very good idea right then, as we can clearly see that the Rangers want to go to the dream world immediately. While Alpha seems to show concern for the Rangers, Zordon is only concerned with Somnibot being stopped "before she does permanent damage". When they morph and teleport to a nearby river to fight Cogs again, Somnibot sings her lullaby to put the Rangers and Cogs to sleep; on Klank's cue, the monster causes the Rangers and Cogs to become sleepy by singing in a very sweet and melodious manner. Becoming very sleepy/weak, Tommy Oliver calls Alpha, but the he notes that Somnibot beat them to the punch and is bypassing the Zeo Rangers' altered power frequencies that he fixed before to make them immune to Somnibot's lullaby.

Before the Rangers can fall asleep and be sent to the dream world, the Gold Ranger shows up to "tuck Somnibot in for the night". Declaring that she isn't ready to be put to sleep herself, Somnibot fires her lasers at him, but he uses the Golden Power Staff to attack Somnibot. Mondo orders her repair.

Upon her return, she is removed of her characteristic sleepiness and is much more alert, and puts Bulk, Skull, and a burglar to sleep. Klank, Orbus and Somnibot take a truck the three humans were nearby to serve as Somnibot's mobile power station.

When the Zeo Rangers get to the three's location on their Zeo Jet Cycles, Somnibot wastes no time. She attempts to sing her lullaby again to put the Zeo Rangers to sleep, while Klank increases her power output.

Back in the Power Chamber, Alpha initiates a power surge while Billy disappears. While Somnibot continues to sing the Rangers into the dream world again, they're suddenly spotted by the Gold Ranger who is ready to fight. Klank asks that she put him to sleep as well, and Somnibot sings her lullaby and this time the Gold Ranger isn't strong enough to fight its effects and he begins to fall asleep too. However, Alpha's power surge works on Somnibot and her frequency terminates, to her anger.

Somnibot then takes on the Rangers directly alongside some Cogs, however the Cogs are quickly defeated while the Gold Ranger takes out Somnibot. Klank has Orbus make Somnibot grow, so the Rangers summon the Zeo Megazord and Red Battlezord to take her on. After beating her around for a while, the Gold Ranger summons Pyramidas and the Zeo Ultrazord is formed which manages to destroy Somnibot for good.

The next day, the Rangers meet in the Power Chamber and comment on how glad they are to have finally been allowed to have a good night's sleep. Tommy then takes the chance to ask Billy exactly what has been going on with him recently given the fact he's always tired despite no longer being a Ranger, let alone his recent mysterious disappearances. Rocky however has come to his own conclusion that Billy is actually the Gold Ranger. Billy denies this, telling the others that he's been working on something that he'd rather not talk about yet and that if he was the Gold Ranger he wouldn't keep that kind of secret from them. While the other Rangers accept this, Rocky still isn't so sure.




  • For a short time when the episode starts the audio is very deep pitched and slightly muffled.
  • When Somnibot was defeated by her frequency shorting out, why weren't the people in the park that she sang to sleep awakened?
  • If Zordon says that it is Somnibot's frequency that must be dealt with first, why does she sing and spread her twinkle dust? What is the purpose of her singing?
  • When Somnibot practices singing and casting her spell onboard the Quadrafighter, her eyes do not glow pink nor does the Cog pulsate with pink energy as he is falling asleep. Later at the riverbed, however, Somni's eyes do glow pink and the Cogs (and Rangers) begin pulsing when she is singing to them.
  • In numerous American shots, Klank and Orbus were missing their spell-resistant headphones.
  • The Cogs were glowing violet or red, apparently affected by Somnibot’s spell as she was singing, but in the next shot, they were no longer violet or red.
  • In one shot of King Mondo, his crown and the gear below it were not turning.


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  • This episode continues the suggestion that Billy could be the Gold Ranger, as he constantly runs off just as the Gold Ranger is about to appear as well as being just as exhausted as the Rangers despite no longer fighting. Skull is also briefly put back in the frame, as he is caught sleeping by Bulk while at work.
  • The episode cuts, or attempts to cut, one detail from Ep. 30: The Earth is Snoring; Klank appears to have a gun that falls out of his hand when the Gold Ranger kicks him into the river rocks.
    • This episode also cuts a body form used by Bara Gūsuka, Somnibot's masculine counterpart—a windup version of herself (complete with winding key) combined with two phonograph horns on top of her head (likely to project her singing towards longer distances), a computer module on her stomach (likely to check the equivalent to her vitals) and a baby doll taped to her back.
  • Like with Fortissimodo, Bulk and Skull do not scream when they see Somnibot in her second form, but Skull instead tries to warn Bulk of her presence.
  • Somnibot is one of the few monsters who can hilariously fall under the power of their own abilities. This is shown after she practices singing and casting her sleeping spell; after she wakes up the Quadrafighter pilot, she yawns and takes a power nap, having fallen under the power of her own cradle song, and tells the pilot to wake her when they get to Angel Grove. The first monster is Robocupid; she falls under her love spell and falls head over heels in mad love with Klank before returning to normal.
  • This episode was likely a filler episode made to save up cash for the reveal of the Gold Ranger's identity. This is evident by the fact that Somnibot sings to the tune of "Rock-a-Bye Baby" four times in the episode, with no new lullabies being sung. Somnibot is only mentioned directly in Mondo's Last Stand when Mondo is mourning her death as well as the deaths of Staroid and the other monsters that the Rangers defeated up until this point.
  • None of the story elements from the Ohranger episode The Earth is Snoring were used. Neither was Bara Gūsuka's second form (built by Kotaro Henna) with the gramophone horns, winding key and computer box) due to the footage containing car pileups and mass carnage. The damage that she could have done was instead only implied by Zordon.
  • Barbara Goodson is credited as Orbus and Sprocket, but isn't credited as Somnibot.
  • Rito Revolto is credited but he, Goldar, Rita, Finster, or Zedd do not appear in the episode.
  • Despite the song "Rock-a-Bye Baby" (and several variations of it) being used through most of the episode (sung by Somnibot), a small bit of "Brahms' 'Lullaby'" is used in the musical score when she (in her megaphone-faced form) puts Bulk, Skull and the burglar to sleep. She does not sing the song outright.
    • This is brought up earlier when Mondo mentions that Somnibot can sing many lullabies to put Angel Grove to sleep during the day.
  • Despite Somnibot being referred to as female during most of the episode, King Mondo accidentally refers to the monster as male. This is because in Ohranger, Somnibot's Japanese counterpart Bara Gūsuka was male, despite being voiced by a female.
  • Somnibot reappears as an audience member in the Machine Arena in King for a Day, having been rebuilt.

See Also

Power nav icon.png List of Power Rangers Zeo episodes Icon-zeo.png

1 & 2: A Zeo Beginning • 3: The Shooting Star • 4: Target Rangers • 5: For Cryin' Out Loud • 6: Rangers in the Outfield • 7: Every Dog Has His Day • 8: The Puppet Blaster • 9: Invasion of the Ranger Snatchers • 10: Graduation Blues • 11: A Few Bad Seeds • 12: Instrument of Destruction • 13: Mean Screen • 14: Mr. Billy's Wild Ride • 15-17: There's No Business Like Snow Business • 18: Inner Spirit • 19: Challenges • 20: Found and Lost • 21: Brother, Can You Spare an Arrowhead? • 22: Trust in Me • 23: It Came From Angel Grove • 24: Bulk Fiction • 25: Song Sung Yellow • 26: Game of Honor • 27: The Power of Gold • 28: A Small Problem • 29: A Season to Remember • 30: Oily to Bed, Oily to Rise • 31: Rock-A-Bye Power Rangers • 32: Do I Know You? • 33: Revelations of Gold • 34: A Golden Homecoming • 35: Mondo's Last Stand • 36: Bomber in the Summer • 37: Scent of a Weasel • 38: The Lore of Auric • 39: The Ranger Who Came in from the Gold • 40: The Joke's on Blue • 41: Where in the World is Zeo Ranger 5? • 42 & 43: King for a Day • 44: A Brief Mystery of Time • 45: A Mystery to Me • 46: Another Song and Dance • 47 & 48: Rangers of Two Worlds • 49: Hawaii Zeo • 50: Good as Gold