Lost in a Space that Isn't There Andromeda : Season 4 Episode 16

After being repeatedly attacked by bounty hunters after several evasive slipstream jumps, Dylan determines that there must be a mole on board. After analyzing data recordings, he discovers that Beka has been infected by The Abyss and has unknowingly been giving away Andromeda's position. Dylan and the crew have to come up with a way to rid Beka of The Abyss -- without killing her.