Dark Matter Season 2, episode 4: Why does Daniela leave?

While there's still been plenty of world-hopping, Dark Matter Season 2 has added an element of psychological family drama to its sci-fi mix.

In short, the Dessens are struggling.

And while the family of three have tried their best to settle into something resembling a normal life, episode 4 suggests that dream is still a long way off.

So, what happens, and why does Daniela (Jennifer Connelly) leave at the very end? We've unpacked it below.

SEE ALSO: The 41 best Apple TV shows, ranked What happens at the end of Dark Matter Season 2, episode 4? After sending Charlie (Oakes Fegley) off to college in a version of Chicago where technology is a long way behind that of "our" world, Jason (Joel Edgerton) and Daniela sit in their suddenly too-quiet apartment drinking tea.

But it's not long before Daniela starts to share something that's troubling her.

"We're not the people we used to be," she says.

"I guess it was crazy to think that we could be.

I think you feel it too.

It's... something's wrong with me." Jason asks her what's going on, and Daniela alludes to the hallucinations she's been having ever since they came to this version of Chicago.

"It's like I'm being followed," she says.

"And I keep thinking I see these versions of you.

But... it's something else.

I'm scared of things that I see in you.