Andreas Katsulas is remembered by Star Trek fans for his striking portrayal of the Romulan Ambassador Tomalak in Star Trek: The Next Generation. His memorable appearances in episodes like The Defector and The Enemy brought nuance to the Romulan character, balancing cunning diplomacy with underlying tension during Captain Picard’s command of the Enterprise-D. Katsulas's presence added weight to the delicate politics between the Federation and the Romulan Star Empire, making Tomalak one of the more complex antagonists in the series. He also appeared briefly in All Good Things..., the series finale, helping to underline the long-standing conflicts that defined TNG’s narrative arc. Outside Star Trek, Katsulas is widely recognized for his role as G'Kar in Babylon 5, where he created another beloved alien character with depth and authority. Within the Star Trek canon, his work remains a highlight for fans who appreciate performances that bring alien cultures vividly to life. His subtle yet firm approach to Tomalak set a standard for later Romulan portrayals in the franchise.