Viewers who'd been craving more of Gary on 'Running Man' will be pleasantly surprised by this week's episode - far more than they had bargained for!

As their first day in Australia wrapped up, the producers stowed the gear for the night, leaving the cast members by themselves.

Left to their own devices with two handheld cameras, the cast members inevitably drew up some mischief, with HaHa and Lee Kwang Soo making a surprise attack on Gary, who was sleeping in, well, his birthday suit!

As revenge for Gary surprising them when they thought he was sleeping, they jerked the covers off the bed, revealing his toned body - and what we are assuming to be a very cute butt underneath that smiley face!

Check out the full episode here.

SEE ALSO: Producer Yoon Il Sang speaks out on NewJeans controversy "Contracts are not a joke"