With the lack of time you have to spend on a story with the medium, I think one of the best options for telling said story is focusing on a single character and exploring/developing them.

This story does as much with our one alien member of the team: Maxie Masters.

Focusing in on Maxie, using her extraterrestrial knowledge, but combining it with the fact she doesn't want the rest of the team to know about her origins, is a really fun premise. Her calling Giles or interfacing with the alien computer, pretending that's where she's getting her information from, is pretty fun, and said alien threat, being a species of paranoid aliens, that attempt to assassinate anyone who knows too much about them, is a really fun idea.

That all said, again this story suffers a bit from the ending. I enjoyed the bit with Giles explaining how people are rationalising what happened, reminding me a lot of The Doctor's similar explanations, and twist, while a little obvious, was fun. The actual events however did feel a little rushed, the conflict was over before it really started, and the explanations once again were simply exposited after the story was basically over.

Still, I definitely enjoyed the character stuff here, and I'm loving the team.