This movie had some potential. It's clearly low budget but with Colin Farrell it has a touch of class to it... but only while he is in it.

The story is a group of specially raised children who are intended to make a long voyage on a generation ship. Meaning they will live out their lives on a fairly smallish vessel, having children who will then have children, who will eventually colonise a new world.

Farrell's character volunteers to go along with the children as an older guide

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About a quarter of the way in the children, now late teens, discover they have been drugged to quell their natural impulses. They come off the drug. The result: two of them decide to kill Farrell's character and things spin out of control.
Up until they bump him off, there is an interesting story about how the children will react as they slowly discover that Richard (Farrell) is lying... and in turn being lied to by mission control. Then... all gone and replaced with a dumb Lord of the Flies nonsense. With the teens finally realising at the end that what they really needed was a girlboss.
[/spoiler]
Starts with some promise and dies a horrible death. Avoid.