George Takei carries on his feud with William Shatner, calling him an "unfit" guinea pig after he became the oldest person in space

Page Six

“He’s a guinea pig, 90 years old and it’s important to find out what happens,” Takei told Page Six of his former Star Trek co-star's hours after Shatner returned to Earth from his Blue Origin spaceflight on Wednesday. “So 90 years old is going to show a great deal more on the wear and tear on the human body, so he’ll be a good specimen to study. Although he’s not the fittest specimen of 90 years old, so he’ll be a specimen that’s unfit!”