|Place of work||Pontypandy Fire Station|
- Hair: Brown
- Eyes: Brown
- Friends: Everyone in Pontypandy
- Crew: Sam, Elvis, Penny, Ellie and Jerry Lee
- Boss: Station Officer Steele
- Superior Officer: Chief Fire Officer Boyce
After completing his training at the Newtown Fire Academy he joined the Pontypandy Fire Service with fellow graduate Ellie Phillips.
Arnold is a bit nerdy & can be a bit of a know-it-all. He tends to nit-pick & is very happy pontificating about water pressures, hose gauges & combustibility but, as yet, doesn't have the practical firefighting experience to back it up.
Episodes Arnold drove Venus
Episodes Arnold drove Phoenix
- John Hasler (UK)
- According to John Hasler's website, he was probably originally going to be called "Arthur".
- It is him who gave the name "Hydrus" to the new rescue vehicle introduced at the end of Heroes of the Storm.
- It was hinted in Space Train that Arnold may be afraid of heights.
- He is the only firefighter at Pontypandy Fire Station who has not driven Jupiter.