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• S4.E1 ∙ An Unexpected Guest
• S4.E2 ∙ Babies, Bunnies and Beards
• S4.E3 ∙ Sally Hunter
• S4.E4 ∙ Quantum Problems and Dead Ends
• S4.E5 ∙ House Arrest
• S4.E6 ∙ The Intruder
• S4.E7 ∙ Mind Games
• S4.E8 ∙ Break-in
• S4.E9 ∙ Relatively Speaking
• S4.E10 ∙ Enemies Within
• S4.E11 ∙ Badika
• S4.E12 ∙ Operation Rockabye
• S4.E13 ∙ Sleepwalkers
• S4.E14 ∙ Saving Anika
• S4.E15 ∙ I Spy
• S4.E16 ∙ Hologram: Unlocked
• S4.E17 ∙ The Missing Piece
• S4.E18 ∙ Testing Times
• S4.E19 ∙ Brainwooshed
• S4.E20 ∙ Showdown