I was involved in the original?
Oh well.
Ideas:
The Saboteur is working with pirates. His mission is to bring critical systems offline to make it easier for pirates to later board and capture the ship. To do this, he will need access to the bridge, engine room, or possibly the ship's computer.
Another possibility is that the ship is carrying more than just colonists. It could be that the colonists are being used as cover to hide certain VIP's or contraband; such as weapons, slaves, or super soldiers. It might be that the saboteur is interested in exposing this cargo, or is doing their best to interfere with the sinister ulterior motives of the ship. Maybe the colonists think they're going somewhere safe, but in reality the Captain and his crew are going to sell them into slavery once they reach their destination.
Another possibility, in line with the Titanic, is that the ship actually collides with an asteroid; causing massive damage. Many are killed immediately, while the survivors do their best to repair the damage to the ship.
Maybe the saboteur takes control of the ship, sets a course for an asteroid, then destroys the helm and engines. The crew have only hours/days to make the repairs and save the ship.
Or it could be "Love Boat in Space" or even the infamous Satellite of Love.
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