I LOVE it when Star Trek brings back actors for a different role! It’s awesome!
Also these were rushed so some of them don’t have all the roles that the actor played.
The first one is Vaughn Armstrong who most notably played Admiral Maxwell Forest in Star Trek: Enterprise.
The second is Jeffery Combs who is best known for playing Weyoun and Brunt in Star Trek: Deep Space Nine, as well as Commander Shran in Star Trek: Enterprise.
The third is John Fleck who played the Chairman of the Tal Shiar, Koval, in Star Trek: Deep Space Nine as well as the recurring character Silik in Star Trek: Enterprise.
The fourth is Marc Alaimo who played Gul Dukat, Star Trek: Deep Space Nine, and Gul Macet, Star Trek: The Next Generation.
Fifth is Tim Russ who most notably played the Vulcan Tuvok on Star Trek: Voyager.
Sixth is Majel Barrett who was the voice of the computer in many of the Star Trek series, as well as the nurse Christine Chapel in Star Trek: The Original Series. She also played Lwaxana Troi in Star Trek: The Next Generation.
Seventh is Tony Todd who played an aged version of Jake, as well as Worf’s brother Kurn, both in Star Trek: Deep Space Nine.
Eighth is Diana Muldaur who most notably played Doctor Pulaski in Star Trek: The Next Generation.
Ninth is John Garman Hertzler who most notably played General Martok in Star Trek: Deep Space Nine.
Tenth is Mark Lenard who played the first Romulan the Starship Enterprise encounters, as well as Spock’s father Sarek in Star Trek: The Original Series.
Most if not all of my information comes from Memory Alpha