Shatner said he did not know Takei very well while working on Star Trek
Actor William Shatner has said he feels "nothing but pity" for his Star Trek co-star George Takei after failing to be invited to his wedding last month.
In a video posted on his website, Shatner said he had no idea why Takei held the grudge that kept him from being invited to the ceremony.
"It's sad. I feel nothing but pity for him," he said.
Takei married his long-term partner Brad Alman on 15 September in front of a number of his Star Trek co-stars.
"The whole thing makes me feel badly," Shatner said in the video.
"Poor man, it's so patently obvious that there is a psychosis there. I don't know what his original thing about me was, I have no idea."
The 77-year-old said he felt he never knew Takei when they worked together on the original TV series and later in the Star Trek films.
"I literally don't know him - I didn't know him very well on the series, but he's continued to speak badly of me all these years," he said.
"You'd think there would be an epiphany at some point where he'd say - as he and I don't have many years left in this world - 'I wish him well', but instead what he does is makes a big deal about not inviting me to his wedding."
Takei and Altman had previously said that Shatner was invited to their wedding, but he did not RSVP.
"It is unfortunate that Bill was unable to join us for our wedding as he indeed was invited to attend," Takei said on his website.
The couple were joined by Takei's Star Trek co-stars at the wedding.
Speaking on US show Entertainment Tonight, Takei branded Shatner's rant as "silliness" and described the actor as having "a big, shining, demanding ego".
He denied the allegation the pair were strangers saying: "We've done six movies together, three seasons of television and been doing Star Trek conventions together for the last 40-plus years - yes I guess he doesn't know us."
"By my sending an invitation to him was burying the hatchet - we keep reaching out and he takes it and twists it and turns it into something that's ugly," he said.
The 71-year-old said he would continue to extend olive branches to Shatner and invited him to join him in his fight to defeat Proposition 8 which seeks to deny same-sex couples from marrying in the state of California.
"Bill used the word psychotic against me, but I think his stability is quite questionable," he added.
Star Trek actors Walter Koenig and Nichelle Nichols, who played Chekhov and Uhura, were the best man and matron-of-honour at Takei's ceremony at the Japanese American National Museum.