"Sentinel" is the fifty-second televised episode of the series Gargoyles, and the thirty-ninth episode of Season 2.
Although Elisa muses, at the end of this episode, over the possibility that the Space-Spawn War could be long since over, that (naturally) is not the case. Greg Weisman had planned a "sequel series" to Gargoyles entitled Gargoyles 2198, in which the Space-Spawn would finally reach Earth in the year 2198 and conquer it. Nokkar, chagrined over having failed to spot their approach (the Space-Spawn's technology had become so advanced by this time that their ships couldn't be picked up by his monitoring systems) throws himself into the struggle to free Earth from the Space-Spawn, joining with a handful of other characters (including Demona, Owen, a time-travelling Brooklyn, and descendants of Goliath, Delilah, Natsilane, and Zafiro) to form a resistance movement.
In a particularly noteworthy animation nit, Elisa's black t-shirt is shown to be long-sleeved while she's taking the tour of Nokkar's spaceship. However, in the immediately preceding episode, The Green, she was wearing a short-sleeved shirt instead.
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