The long-running cast member, who plays Paul Robinson in the Aussie soap, joked that the only downside to Mason receiving the nod for 'Most Popular New Talent' might mean that the 22-year-old is not scared of him anymore.
Dennis told Channel 5: "'He may be 'Freckles' to Paul; however, I'm thrilled for James and it's well-deserved recognition for the hard work he has put in. However, nothing is going to change on set; I still want him to be afraid of me."
Mason said that he is "very grateful to everyone who voted" for him, adding: "Mum has been a bit like a campaign manager and I seriously thought she was going to hurt herself when she found out. The whole family are rapt and as I keep saying, just to be nominated is fantastic."
The actor made his Neighbours debut in 2010 but only became a cast regular last year. His alter ego Chris Pappas is the soap's first regular gay character.
Other nominees in the 'Most Popular New Talent' category at the Logies include Dan Ewing and Steve Peacocke from Home and Away, Winners and Losers star Tom Wren and Peter Kuruvita.
The Logie Awards take place on April 15.
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