USS Curie (NCC-1690)
In an early draft of the script for  episode , the USS Curie (NCC-1690) was a  Federation starship that was supposed to be another ship that unsuccessfully experimented with the spore drive. 

The ship's designer, John Eaves, "drew a whole new vessel, a CG model was done, and we did a paint-over for it. That ship had to do this weird thing where it got distorted in some kind of time warp scenario, so I used Photoshop to add a ripple effect across the surface of the ship to show what the damage would look like. It wasn't like panels getting ripped off as you would expect, but more of a bizarre warp transition, but suddenly that all went away and they rewrote the Currie out of it and put in a  ship like the Discovery, which ended up being the Glenn. I think because those shapes were already known for having the spore drive that wasn't working, it lent itself better to the story than an entirely different ship." (Star Trek: The Art of John Eaves, p. 196)

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