After last week's show when his hungover performance and description of chicken as "a vegetable" cast him as the character of this season's contestants, all eyes were on the bushy-bearded country boy tonight.
But Mr Trevathan struggled with his "mystery box" of ingredients and copped a withering blast from judge Simon Gault for his grilled pork chop and salad.
"One of the worst things I've seen on Masterchef, it's crap," Gault said.
Mr Trevathan, who said after presenting his dish he was "80% confident I'm out of here", was shortly afterwards told to pack his bags.
Otago's hopes in the hit show remain alive though in the form of Oamaru man Michael Gin who scraped through to the next round.