George Takei did star in “The Encounter,” the only Twilight Zone episode widely identified as having been withheld from the show’s syndication package, although the restriction was later lifted.
George Takei starred in the only episode of "The Twilight Zone" that was banned from syndication.

2 Years Before Star Trek, George Takei Starred in a Controversial Twilight Zone Episode That Was Banned in the US
Source: cbr.com
Key Evidence
“The Encounter,” which originally aired in 1964, starred George Takei alongside Neville Brand.
What the Evidence Shows
George Takei starred as Arthur in “The Encounter,” a 1964 episode of The Twilight Zone featuring Neville Brand. The episode was removed from syndication after criticism of its portrayal of Japanese Americans, and multiple accounts describe it as the series’ only episode to be pulled from regular syndication because of controversial content.cbr.comcbr.com2 Years Before Star Trek, George Takei Starred in a Controversial Twilight Zone...
grunge.comgrunge.comWhy George Takei's Twilight Zone Episode Was Once Withheld From Syndication+3 more