After a wild night out with Erica and Freddy, Nikki and Jason are faced with potentially disastrous consequences the next morning.

Deciding that they need more hands-on experience looking after kids, Nikki and Jason agree to babysit their friends’ children for a day.

The TARDIS brings its crew to a quarantine facility for victims of an alien plague. When Amy is trapped, Rory must rescue her from the facility’s doctors but learns something…