|Place of work||Pontypandy Fire Station|
After completing his training at the Newtown Fire Academy he joined the Pontypandy Fire Service with fellow graduate Ellie Phillips. It is him who gave the name "Hydrus" to the new rescue vehicle introduced at the end of the special.
Episodes Arnold drove Venus
Episodes Arnold drove Phoenix
- 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
- According to John Hasler's website, he was probably originally going to be called "Arthur".
- 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.