One of the two stories in Birthright has Data working alongside Julian Bashir when the Enterprise visits Deep Space Nine. The android is caught by an energy discharge and begins to dream well that's our crossover. It wasn't originally intended to have Bashir appear in the episode, instead it was meant to be Jadzia Dax but Terry Farrell was busy filming the Deep Space Nine episode Move Along Home. It is a blessing that Birthright isn't as bad as Move Along Home, but neither of the two stories are that engaging. On the one hand, you have Worf investigating a colony of Klingon/Romulan hybrids and in the other story you have Data dreaming about his father being a blacksmith. While both stories seem like they could have had ongoing effects to the characters, neither are ever mentioned again. Another actor who is better known for a different role in the franchise also appears in this episode - James Cromwell. He appears as Zefram Cochrane in Star Trek: First Contact and appears in Birthright as Jaglom Shrek, but is barely recognisable under the makeup. His part was to have been bigger in this two-part episode, but he broke his leg between the first and second parts and he had to be written out.
