This list is for characters who only appear in 3-2-1 Penguins!, listed in chronological order.
Mr. and Mrs. Conrad
Mr. and Mrs. Conrad are the parents of Jason and Michelle. They send their kids to Grandmum because they're going on a business trip, according to Ron Smith.
They were only seen in Trouble on Planet Wait-Your-Turn, though they're mentioned a few times in later episodes.
Voice Actors
- Pamela Thomas (Mrs. Conrad)
- Ron Wells (Mr. Conrad)
Fun Facts
- They're the only human adults besides Grandmum to be in the series.
The Bandicoot King
The Bandicoot King is one of the kings in Space Base Bullamanka.
He first appeared in The Cheating Scales of Bullamanka and appeared as a background character in The Comet Lounge ever since.
Voice Actor
Squid Girl
Squid Girl is a pink humanoid alien. She mostly often appears in The Comet Lounge.
There were some episodes where she seems to have a relationship with Zidgel.
Voice Actor
Fun Facts
- She was never mentioned by name in the show, but it is revealed in concept art.
- Some fans called her "Sally Lite", which the name originated from deviantART user ZootyCutie.
Trevor
Trevor is a close friend to Jason.
Voice Actor
Barthos
Barthos is a sheep from Planet Picket.
He was the judge of the meeting over which side has the greenest grass.
He only appeared in The Green-Eyed Monster.
Fun Facts
- He is the only inhabitant to be both bluish and pinkish in color.
Chancellor Gutt
Chancellor Gutt is the ruler of Planet Gutt.
Fun Facts
- According to Tim, he was made to be alien like because they didn't want the viewers to confuse him with Admiral Sowmaster.
Flam Mingo
Flam Mingo is a lawn flamingo from Planet Sharalike.
The lawn gnomes declared war on him and the lawn flamingoes.
He only appeared in Give and Let Give.
Voice Actor
- Trevor Devall
Jeff
Jeff is a lawn gnome from Planet Sharalike.
He declared war on the lawn flamingoes.
He first appeared in Give and Let Give and appeared as a background character ever since.
Voice Actor
- Lee Tockar
Fun Facts
- His real name is Nutty Mcfluffyplants.
Gordon Shtick
Gordon Shtick is a stick figure-like alien who is a comedian.
He offered Jason a chance to perform at the Comedy Hole in Sector 12 after he saw his stand-up act. Later on, when he found out Jason's embarrassing secret, he reassures him that he won't tell anyone.
He only appeared in Comedy of Errors.
Fun Facts
- Although he is a comedian in Sector 12, it's not specified whether he is a comedian in the Comet Lounge.
Miso Guapo
Miso Guapo is a lobster-like alien who is the host of the Miso Guapo Convention in Sector 9.
He only appeared in Invasion of the Body Swappers!
Fun Facts
- Cedric Hohnstadt designed him as a George Hamilton-type of alien.
Future Midgel
Future Midgel is Midgel's future self.
He, along with Future Fidgel and Future Zidgel, tried to give advice to their past selves, only for their advice to be ignored.
He only appeared in Wise Guys.
Voice Actor
Future Fidgel
Future Fidgel is Fidgel's future self.
He, along with Future Midgel and Future Zidgel, tried to give advice to their past selves, only for their advice to be ignored.
He only appeared in Wise Guys.
Voice Actor
Future Zidgel
Future Zidgel is Zidgel's future self.
Like Future Midgel and Future Fidgel, he tried to give advice to their past selves, but his advice was more obvious.
He only appeared in Wise Guys.
Voice Actor
- John Payne
Admiral Sowmaster and Cash
Admiral Sowmaster and Cash are pig-like aliens in charge of the Pig-O-Bank Cruiser.
They only appeared in Hogs and Kisses.
Fun Facts
- Sowmaster is based after Edward G. Robinson.
- Concept artist Cedric Hohnstadt stated that Sowmaster was tall, while his assistant was short. This was changed by Tom Bancroft.
Gizmoid
Gizmoid is a robotic fox.
He only appeared in 12 Angry Hens.
Voice actor
Fun Facts
- Even though he's based on a fox, his mouth moves more like a beak.
- His voice is reminisces to to Edd/Double Dee from "Ed, Edd n Eddy", a character Sam voiced before.
Old Robotic Scarecrow
The robotic scarecrow stands on a small asteroid with stocks of corn around him.
When the Rockhopper crew was trying to find Cavitus who stole the Royal Egg, they found a robotic scarecrow who tries to point them where they went. Michelle immediately thought they should go left, but Fidgel said to wait and see if he's actually pointing the right direction.
He only appeared in 12 Angry Hens.
The Emperor of Planet Kennel
The Emperor of Planet Kennel is a purple dog-like alien who owns many cato'pillows.
He only appeared in Kennel Club Blues.
Voice Actor
Fuzzy
Fuzzy is a sock monkey who promised to keep her finger in the dam hole.
She only appeared in Promises, Promises.
Voice Actor
Fun Facts
- She speaks with a Scottish accent.
Cow Commander
The Cow Commander referred as Bessie by Zidgel, is the leader of the alien cows.
She contacted the Rockhopper.
She only appeared in In the Big House.