William Shatner hasn't spoken to George Takei in 25 years.

The 84-year-old actor - who appeared as Captain James Kirk in the popular sci-fi series 'Star Trek' - has revealed he's retained no relationship with his former on-screen co-star, describing him as ''disturbed''.

He said: ''He is a very disturbed individual, the truth of the matter is.

''I don't know him. I haven't seen him in 25 years, I don't know what he is up to. It is not a question that has any meaning to me. It is like asking about George Foreman or something.''

The feud between the actors dates back to their time on the TV show together, with George having branded his co-star a ''douche'' in the past.

Meanwhile, William has been heavily linked with a cameo role in the next installment in the sci-fi film franchise, but has dismissed the rumours, saying such issues are in the hands of director J. J. Abrams.

Reflecting on the possibility, William told News.com.au: ''No matter what plans I make it is J.J. Abrams who makes the plans and no, I don't think he is planning anything with me.

''I would love to. In one year it will be our 50th anniversary and that is incredible.''