Babylon 5: Thirdspace (1998 TV Movie)
The Epsilon 3 backgrounds are a direct nod to the backgrounds of this film.
The Sulaco designs influenced the look of the Earth destroyers.
Dr. Elizabeth Trent refers to Lyta's first telepathic contact with Ambassador Kosh.
Dr. Elizabeth Trent refers to the fact that humanity received Jumpgate technology from the Centauri 100 years earlier.
Sheridan refers to President Santiago's assassination.
Sheridan refers to Babylon 5 declaring independence.
Sheridan refers to the end of the Shadow War.
Sheridan refers to President Clark's embargo against Babylon 5. He later recalls Lyta telling him that she may still have leftover Vorlon programming in her mind.
While drifting in hyperspace, Delenn says to Lennier, "No one knows what's out there. Maybe we'll find a million-year-old jumpgate left behind by the First Ones."
Many elements of the backstory directly refer to the plot.