The Royal Four save the human race from a deadly alien virus.

Story by Jason Katims and Ronald D Moore
Teleplay by Gretchen J Berg, Aaron Herberts and Breen Frazier
Directed by Paul Shapiro

The final part of this four-part mini-series is shocking and just as rushed as the previous four.

It's a bit of a muddle, but an entertaining muddle made of thrilling ingredients.

There's a lot of surprising comedy as Maria and Michael live the high life at the expense of Laurie's deceitful relations. We still don't quite know how Michael is connected to her, but it's got something to do with her abductee grandfather.

Similarly entertaining is the chance to see Kyle and Alex bonding as they're trapped in the alien nest.

Meanwhile, it's a shame about poor Grant. Isabel finally finds a man she can love - only to discover he's been possessed by a giant blue space prawn.