This issue is a variant of Star Trek (DC, 1984 series) #50 [Direct].
There exist further variants.
On-sale date from Amazing Heroes #134.
Though promoted as having a cover by Mitch O'Connell, the letters column in #54 explains that due to production problems, "Ed Hannigan stepped in to render the cover."
Final part of a 3-part story. Story continues from the previous issue.