"I just want to know you're OK," Walter Koenig said in the appeal. "If it means you just want to stay here, that's OK. You don't have to come back. Just let us know that's your intention."
Koenig was visiting friends in Vancouver when he went missing more than a week ago, The Associated Press reports.
Walter Koenig, best known for playing Pavel Chekov on the original "Star Trek" television series, said yesterday his son stopped taking antidepressant medication about a year ago.
Vancouver police Constable Tim Fanning says there has been no activity on Koenig's cell phone or bank records since Feb. 16.