Harrington, who has appeared in Underbelly, Neighbours, Bastard Boys, SeaChange and The Dish, will play Cliff Young, the 61 year-old Victorian potato farmer who beat the finest distance runners in the 1983 Sydney to Melbourne ultra marathon.
Roy Billing will play trainer and masseur Wally Zeuschner.
Harrington has already been training and losing weight ahead of filming, which starts in mid April across Albury-Wodonga and regional Victoria.
“I’ve got a place up the country and and I’ve been quietly running around (in gumboots). Luckily nobody has driven past me while I’ve been doing it because they probably wouldn’t believe it,” he told the Herald Sun.
Carole Sklan, ABC TV’s Head of Fiction said, “Few stories capture the public imagination like that of Cliff Young. Nearly 30 years after famously shuffling from Sydney to Melbourne and into Australian folklore, Cliffy continues to fascinate and inspire. We are delighted to be partnering with such an accomplished creative team to bring this iconic tale to ABC TV.”