Babylon 5: Gropos (1995)

Synopsis
Babylon 5 plays reluctant host to 25,000 ground-pounding Earth troops, who, acting under secret orders, have been assigned to snuff out a rebellion. Exacerbating an already unpleasant situation is the fact that the troop's leader (Paul Winfield is Dr. Franklin's long-estranged father. The title of this episode refers to a vindictive alien race, from whom Delenn can expect no good. Written by Lawrence G. DiTillio, "Gropos" was originally broadcast on February 8, 1995. ~ Hal Erickson, All Movie Guide