Not Cancerhouse M.d. : Season 5 Episode 2 -

: Apple begins to see the world as "ugly" and loses her vision, even though her eyes are physically healthy. 🩺 The Diagnosis: Cancer Stem Cells

: Apple is played by Felicia Day , the sixth guest star in the series to have also appeared in Buffy the Vampire Slayer . 🧬 Themes: Perspective and Truth Not CancerHouse M.D. : Season 5 Episode 2

: An elderly man who received a kidney and is the only other survivor at the start. : Apple begins to see the world as

: A math teacher who received a corneal transplant and is the focus of the case. Not CancerHouse M.D. : Season 5 Episode 2

: Apple reveals that she was happier when she was blind; regaining her sight only showed her how "ugly" the world really is.