Yes. That. William. Shatner. The big man. Numero uno honcho. Head cheese. The Shakespearean-trained actor, singer and horseman whose singular career includes a 1966 horror film in the made-up language of Esperanto, “Twilight Zone,” “T.J. Hooker,” singing Elton John’s “Rocket Man” and Black Sabbath’s “Paranoid,” fighting tarantulas in “Kingdom of the Spiders” and of course, his definitive role as Capt. James T. Kirk on “Star Trek,” one of the all-time greatest science fiction franchises. Tonight, Shatner will take the stage after a screening of fan favorite, “Star Trek II: the Wrath of Khan,” to perform and answer questions from the audience. Come prove that your fandom hasn’t been a “colossal waste of time,” as he once quipped in a famous Trekkie sketch on “Saturday Night Live.” 7:30 p.m. $41-$61. altriatheater.com.