Stewart is not the only actor to appear in both a "Star Trek ... On the original "Star Trek," Colicos played the first major Klingon character, Kor, in "An Errand of Mercy." ...

In the fifth season of Star Trek: Lower Decks, he played both Legnog — the faking-it Klowahkan food critic with all the plumage — and Malor — the hapless but extremely helpful Klingon ...