What went down on the base all those years ago? Beatrix, Bartholomew and Bob all try to make sense of Al’s story.

Beatrice and Robert are tasked with enforcing a brutal new protocol on the base – only to find themselves under siege from a new threat.

As she faces down hordes of “misfires” in the lower levels, Beatrice gets more help than she wants.

Deep below the base, Barty, Robert and Alberta try to locate Beatrice while she faces down her former teammates.

While the base crew celebrates a new amalgamated holiday, Beatrice discovers that their scientific research has gone terribly wrong.

The crew take a break to play some board games.

A mysterious new staff therapist joins the crew at the base. This episode is dedicated to our Captain and friend, Mbula Enobong.

Al takes a trip through his memory banks.

Barty, Beatrice and Alberta make a harrowing escape.

Alberta stows away on a dangerous mission.

Beatrice is assigned a difficult task. Alberta helps out the Director.

There’s more bad news at the base – but for young whiz kid Alberta Langley, there might be a silver lining.