Alan Cumming has offered a $10,000 (£8,000) reward for information regarding Tonka, the missing chimpanzee who starred alongside him in the 1997 comedy Buddy.
The series featured Cumming, alongside Robbie Coltrane and Rene Russo, and was about a couple who adopt and raise Buddy, a feeble young gorilla.
People for the Ethical Treatment of Animals has also included a matching reward for information, bringing the full amount to $20,000 (£16,000).
Originally, Peta had sued the Missouri breeding facility over the chimpanzee’s “filthy, virtually barren” living conditions.