[s4e3] Alone In The World 🎁 Fresh

: To save Aaron, Walter must find a way to break their emotional and physical link without using lethal force, eventually realizing that tranquilizing Aaron's emotions causes the organism to die off naturally.

: Throughout the episode, Walter is haunted by "hallucinations" of a mysterious man—revealed to be Peter Bishop trying to break back into the timeline. [S4E3] Alone in the World

: Walter realizes the fungus is a vast neural network functioning like a giant brain. It protects Aaron by attacking anyone who threatens him, but the bond is symbiotic; killing the fungus could kill Aaron. : To save Aaron, Walter must find a