The Invisible Enemy: Part Two
Doctor Who: Season 15, Episode 6
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As the Doctor's condition worsens, he instructs Leela to pilot the TARDIS to the Bi-Al Foundation. The only chance of curing the Doctor is to literally get inside his head.
Show: Doctor Who
Air date: October 8, 1977
Director: Derrick Goodwin
First broadcast: 1–22 October 1977