British heavyweight Tyson Fury says he "wants rid of a boring person" like Wladimir Klitschko from boxing.
The pair fight for the Ukrainian's world heavyweight titles in Dusseldorf, Germany on 24 October.
Fury, 26, is unbeaten in 24 fights while 39-year-old opponent Klitschko has not lost a bout for 11 years.
"You have about as much charisma as my underpants - zero. I'm interested in breaking your face in," Fury said at a news conference.
Klitschko is WBA, IBF and WBO champion and last lost in 2004 to Lamon Brewster.
The fight against Fury will be a record-breaking 28th heavyweight title bout for Klitschko and his 19th defence in his second reign as world champion.
Fury says Klitschko's time at the top is coming to an end and he is the "new blood" now.
|Tale of the tape|
|6ft 6in (1.98m)||Height||6ft 9in (2.06m)|
|242lb (110kg)||Weight||262lb (119kg)|
"I'm interested in all of them belts you've got on there. I want to rid you out of the heavyweight division," added Fury.
"Your jab-and-grab style - surely all of Europe wants to see you get beaten and the world will see you get beaten.
"You go on - you're a sports psychologist, you speak 37 different languages, so what? You're still a robotic person.
"You're still not exciting and fun to watch. I am the new blood in the division, you are an old man."
The 6ft 9in fighter from Manchester beat Romania's Christian Hammer in his most recent contest.
Klitschko says Fury is a divisive figure in the sport: "This guy is so entertaining. He sings, he dances, he is a cool dude. He does different things that people like - or hate.
"Some people adore you, some people say they can't stand you, which is good."