In addition to voicing Space Ghost in 1966, Gary Owens also had a recurring role as a TV news anchor on The Green Hornet. Owens was also doing promos for CBS' Saturday lineup, a gig he had at least through the 1969-70 season while also on Rowan & Martin's Laugh-In, and also served as a studio announcer for ABC around this time, often heard doing commercial bumpers for shows such as Bewitched.
In "The Preying Mantis", Owens is heard in 2 segments, but the focus is on the plot itself. Low Sing (Mako) has corrupted a local Chinese tong while in the employ of mobster Duke Slate. The climatic battle between Low Sing and Kato (Bruce Lee) is worth the price of admission alone.
Years later, Mako would endear himself to cartoon fans as the voice of Aku, the big bad of Samurai Jack, but passed away before [adult swim] could revive Jack, which has since concluded its story.
Rating for "The Preying Mantis": A.