the Enterprise-C is in awe of the newer ship's technology, and Picard is confronted with whether to reveal to his guests their ultimate fate. An Enterprise-C ensign accidentally discovers the fate of his vessel and panics, requiring Worf and Riker to capture him after he attempts to escape. When Golecian warships attack, Picard defends the Enterprise-C using the same maneuver that caused the vessel's destruction in the past. The ensign goes back to his ship, which returns to the past and its certain destruction. Due to the backlog of scripts, the processing of draft submissions could take anywhere from weeks to a year. Ganino's script was "logged" on May 2 and first read later that month by Richard Manning, a co-producer on the writing staff. Manning commented that the draft was "not horrible, not particularly original, but good in spots, lousy in others". This review was enough to keep the script in circulation. Executive story editor Melinda Snodgrass read Ganino's speculative script for "Yesterday's Enterprise" in June and attached a post-it note declaring the story an "interesting idea". A "coverage" of the script, which outlined the plot and provided creative feedback, was written in August. This analysis called the script a "good effort by an unrepresented writer", and considered the script's weak characterization and plot issues correctable. The main issue was whether the producers wanted to do a show with time travel. Meanwhile, Ganino and Stillwell struck up a friendship and began to develop ideas for other episodes. Gene Roddenberry had distributed a memo that said the return of Leonard Nimoy as Spock would be unlikely due to financial considerations, and suggested that a reasonable alternative would be to feature Mark Lenard, who played Spock's father Sarek. During the same period, Stillwell met Denise Crosby – who played Tasha Yar in the series' first season – at a 1989 fan convention in San Jose. Over dinner, Crosby admitted she missed being part of the series and suggested that Stillwell write a script to bring back her character, who was killed off in the episode "Skin of Evil". Ganino and Stillwell began to work on script ideas that would involve both Yar and Sarek. Ganino and Stillwell were particular fans of two episodes from the original Star Trek series, "Mirror, Mirror" and "The City on the Edge of Forever", and wanted to combine elements from them for a Next Generation episode.