yes
si
UPN, Paramount's own TV network at the time
You can play as a vulcan in the MMORPG Star Trek Online
No. He never had a role on Star Trek.
Star Trek Online is now Free-to-Play
The internet
No.
Commander William Riker in Star Trek: The Next Generation .
Chad Lowe never appeared on Star Trek Enterprise.
Scott Bakula played Captain Jonathan Archer in Star Trek: Enterprise.
Andreas Katsulas is best known to Star Trek fans for playing the recurring character of Romulan Commander Tomalak.
Mel Metcalfe was not a cast member; he was a crew member. He was a re-recording mixer for Star Trek II: The Wrath of Khan and Star Trek IV: The Voyage Home.
No. Endora was played by Agnes Moorehead, who died in 1974, several years before The Wrath of Khan was filmed. She was still alive when the episode of the Star Trek TV series in which Khan first appeared ("Space Seed", 1967) was filmed, but she wasn't in that either.