What Could Have Been: As mentioned before, at the end of season 1, the intention was to have Catalina stay dead, and have Elmira take her place on the Christa. However, Nickelodeon squashed both parts of that, saying that 1) children wouldn't be emotionally capable enough to comprehend a character death and 2) Elmira was too alien. Thus Catalina's death was rewritten as being pushed into another dimension, and Elmira was written out and Suzee was written in.
On his website, Peter David went over numerous ideas for the series finale of Space Cases, including crossovers with both Lost in Space and Babylon 5. Nickelodeon executives refused outright, claiming kids wouldn't be familiar with either.