|Occupation(s)||Magister ranked Plumber|
|Powers and Abilities|
|Abilities|| Steel-Bending Jaws|
|Voice Actor||Rob Paulsen|
|First Appearance||The Mother of All Vreedles|
In Ultimate Alien, like fellow Piscciss Volann, he has grey skin, purple eyes, and an antenna on his head and gills. But unlike fellow Piscciss Volann, he has three fingers in each hand, black eyebrows and neat teeth. He wears glasses and a Plumber suit, but without pants.
In Omniverse, he now has yellowish-grey skin, different eye shapes, green eyebrows, sharp teeth, he is taller and his face is more pointed. He also wears glasses and a different Plumber suit with pants.
In Gone Fishin' he was fishing with Max, Ben and Rook in Undertown at the Spaceman's Wharf. After Ben couldn't catch anything he turned into Ripjaws and dived into the water with Patelliday. While they were swimming underwater, Patelliday snapped at a Mechaneer which was covered by fishes. The Mechaneers took him and Ben couldn't save him because the Omnitrix timed out. The Mechaneers took him to a pirate who refused to eat him fresh. They then took him to the kitchen. Patelliday eventually freed himself and with the help of Ben's team they arrested the pirate.
In The Frogs of War: Part 2, after the Incursean invasion, he was taken to custody just like every other Plumber (with the exception of Blukic). He was locked into the same cell as Driba, who gave him his water after he got severely dehydrated. He was rescued by Rook, Kevin, Gwen and Bullfrag. After he got supplied, he joined Rook to defeat Psychobos.
In O Mother, Where Art Thou? , he called Ben and Rook to the Plumbers’ base after Ma Vreedle started a rampage there. Patelliday told Ma that they don’t have the Pretty Boy that she is looking for. Ma then reports the missing of her child and threatens the Plumbers that if they don’t find him she will blow up the sun. Patelliday told her not to worry and put a tracker to her back. He followed Ma in the sewers and told Ben her location.
In Mud is Thicker than Water, he and Ben chased Sweet-Eels Sparklefunk, Liam and Tummyhead who were at the possession of top secret Plumber Tech. He knocked over Sweet-Eels, while Ben defeated Tummyhead but they couldn't get Liam (who later revealed to be Lucy). Later, when they arrived Psyphon’s hideout, Patelliday shot Bug-Lite. Lucy told him that Gorvan was the spy, so he commanded the Plumbers to find Gorvan.
In Animo Crackers, Patelliday got annoyed by Ben who was eating and drinking loud while they tried to work. He then told Ben not to mess around with the monitors. Suddenly, Rook appeared and accidentally scared Patelliday. Later, he, Rook and Upgrade failed to stop Animo from escaping.
Powers and Abilities
Like Magister Pyke, Patelliday possesses extraordinary skills in martial artistry and agile swimming, underwater respiration abilities, sharp claws and teeth, and legs that can shift to make a fish tail and back.
Ben 10: Ultimate Alien
- The Mother of All Vreedles (first appearance)
Ben 10: Omniverse
- The More Things Change: Part 1 (first re-appearance; cameo)
- The More Things Change: Part 2 (cameo)
- So Long, and Thanks for All the Smoothies (cameo)
- Gone Fishin'
- Tummy Trouble (cameo)
- The Frogs of War: Part 1 (cameo)
- The Frogs of War: Part 2
- O Mother, Where Art Thou?
- Mud is Thicker than Water
- A Fistful of Brains
- Max's Monster
- Animo Crackers
- Catfight (cameo)
- And Then There Was Ben (alternate timeline; cameo)
- The Rooters of All Evil
- Universe Vs. Tennyson
- Weapon XI: Part 2
- Clyde Five
- Rook Tales
- According to Phil, Magister Patelliday was the first alien he saw in the Plumbers' Base on Earth.
- Patelliday's voice is a homage to comedian Don Knotts, who starred in the film The Incredible Mr. Limpet as a man who becomes a fish.
- Patelliday even looks a bit like the film title character in fish-form.
- As the second-in-command of a law-enforcement organization, Patelliday is also an homage to Don Knott's character of Barney Fife, from The Andy Griffith Show.
- His girlfriend, Peta Lou is a play on Thelma Lou, who is Barney Fifes girlfriend in the Andy Griffith Show.
- According to Derrick J. Wyatt: