In "State of Flux", Seska is revealed to be a Cardassian spy who had infiltrated a Maquis cell that was absorbed by Voyager. During her time with the Maquis, Seska had a love affair with Chakotay.

Sisko's wife, Jennifer, was among the casualties of the Battle at Wolf 359.

In "Extreme Risk", B'Elanna Torres tells Neelix that her grandmother used to make her banana pancakes with maple syrup and it always put a smile on her face. Neelix responds by replicating a stack of banana pancakes. "Well then," he says, "one smile coming right up."

In order to catch the traitorous Michael Eddington, Sisko launches a biogenic weapon composed of trilithium resin that poisons the atmosphere of a Maquis colony and forces Eddington to surrender. Needless to say, he doesn't clear this tactic with Starfleet.

Wesley Crusher arrives on the Enterprise-D with his mother, Beverly Crusher.

Dr. Julian Subatoi Bashir is the Chief Medical Officer of space station Deep Space Nine and the U.S.S. Defiant.

Shatner and Nimoy have appeared together in episodes of six different series: The Man from U.N.C.L.E. (1964), Mission: Impossible (1966), Star Trek (1966), Star Trek: The Animated Series (1973), T.J. Hooker (1982) and Futurama (1999).

While at the academy, Wesley joins an elite group of cadets known as Nova Squadron. His involvement with the group leads to his losing academic credits when a squadron-mate is killed attempting a dangerous and prohibited flight maneuver.

Dax is a Trill symbiont--a life form that lives inside humanoid hosts.

In "Encounter at Farpoint", Q puts Picard and the Enterprise crew on trial, arguing that humanity is a dangerous race and should be destroyed. When they later save the life of a kidnapped alien, Q agrees to defer judgement, though he suggest this won't be his last word on the matter.