I started this thread for VOYAGER, but it works for every series. Casting is a very important part of any television/movie production. You can have a brilliant script, phenomenal sets, superb visual effects... but if roles are not cast right, it can spoil an otherwise flawless production. The main cast is obviously at the center, but there are guest stars who come in for an episode that are not only great in the role, but elevate the entire episode... even outshining the leads. Or have such great chemistry with soneone else that you really wish they appeared more. I am curious to see who everyone here thinks were extraordinary guest stars. I will start. "FALLEN HERO" - Fionnula Flanagan, as Ambassador V'Lar. I thought she elevated the script with her performance, and she played off really well with all the regular cast, particularly T'Pol. It was a shame we didn't get to see her again.