Barry Russo played Lieutenant Commander Giotto, the security chief in The Devil in the Dark, and Commodore Robert Wesley of the USS Lexington in The Ultimate Computer.
Barry Russo (1925–2003) appeared twice in The Original Series as Starfleet officers.
In The Devil in the Dark he is Giotto, who leads the Enterprise security detachment hunting the creature in the tunnels of Janus VI. He holds the angry miners back at Kirk's order, and later lets them through when he believes the captain is in danger.
In The Ultimate Computer he plays Commodore Bob Wesley, an old friend of Kirk who commands the war-games squadron from the Lexington. When the M-5 computer attacks in earnest and cripples the Excalibur, Wesley obtains permission to destroy the Enterprise but holds his fire when Kirk lowers the shields, gambling correctly on his compassion.