The show's fifth season has seen Walt (Cranston) and Jesse (Aaron Paul) working with several new characters, and Cranston confirmed that not all of their cohorts will prove trustworthy.
"You're living in an underworld, where there's criminals and liars and murderers, and your organisation is only as strong as your weakest link," Cranston explained to IGN.
"We get exposed to our weakest link this series."
The most recent episode 'Hazard Pay' introduced former Friday Night Lights star Jesse Plemons as Todd, a pest exterminator who offers assistance to Walt and Jesse.
Another new character was introduced in the previous episode, in the form of Laura Fraser's mysterious Lydia.
Watch the Breaking Bad cast discuss the new season with Digital Spy below: