10 Times Star Trek Reused Ships And Hoped You Wouldn’t Notice
4. Tarellian Plague Ship/Ktarian Vessel
The distinctive Tarellian Plague Ship that appeared in Haven was one of designer Andrew Probert's favourite projects for The Next Generation. He recalled that, after the Enterprise itself, this model gave him some of his fondest memories, as it had been a collaboration with Gene Roddenberry himself.
Probert had become stuck when it came to the overall design. He knew that he wanted it to be different from the standard engines-at-the-back shape that tended to dominate starships, so he came up with the idea of placing the engines at the front of the ship. He also based his design on Herman Zimmerman's plans for the main bridge, allowing him to build out around it.
It was Roddenberry who suggested moving the power source to the middle of the ship, which led to the spherical design as seen in the episode. This would be the only appearance of the ship in this configuration. The nose was subsequently altered to sport a more triangular shape, while the hole was removed from the ship's centre, then covered with deck plating.
In this shape, it returned several more times, including as the Ktarian vessel in The Game, the Hunters' ship in Captive Pursuit, and the Zalkonian ship in Transfigurations.