Where are you Scooby-Doo?

Scooby-Doo has become one of Queensland's most wanted after giving police the slip during a reckless track invasion at the Ipswich Cup race day. Not only did the memorably-dressed prankster evade arrest, he also failed to return the eye-catching outfit to the store from which he hired it.

Michelle Johnstone from Hidden Identity Costumes at Cleveland in Redland City said the driver's licence the man used in the transaction turned out to be stolen.

"It was obviously a pre-meditated crime. He put a bit of planning into it," Ms Johnstone said, pointing out he had "definitely lost his $40 bond".

Ipswich police are also keen to hunt down Scooby-Doo following the "reckless" behaviour of the wearer.

"We're still making enquiries into where Scooby-Doo is," said Senior Sergeant Roger Wilson.

"We'd ask that anyone who recognises him to contact Ipswich police."

Ipswich Turf Club general manager Brett Kitching said the man almost "got cleaned up" by the horses after sauntering on to the track at the 300m mark during the final race.

"It is a potentially life-threatening action to run on to the track," said Mr Kitching. "

Just a few hours earlier we had a fall involving four horses, one of which had to be destroyed. It doesn't take much to spook a horse and the results can be life threatening."

Two other men who piggy-backed each other on to the track in pursuit of Scooby-Doo were arrested and charged by police, and will face Ipswich Magistrate's Court on July 14.