A holographic character in Tom Paris's Captain Proton holodeck programme, the black-clad henchman and chief of defence to the villainous Doctor Chaotica.
Lonzak appears in the Voyager episodes Bride of Chaotica! and Shattered. Like the rest of The Adventures of Captain Proton he is presented in black and white, in the style of a 1930s film serial, and serves Chaotica with nervous devotion.
In Bride of Chaotica! he captures photonic visitors from another dimension who take the programme for reality, sparing himself punishment for letting Proton escape. When Janeway enters the story as Queen Arachnia, her pheromones leave him smitten, and she knocks him out on her way to disabling the lightning shield.
In Shattered, with Voyager split into different time periods, he seizes Chakotay and a Janeway from seven years earlier in the holodeck's zone. The two bluff their way past him and his master by playing along with the plot.