Five Hundred Eyes: The Doctor and Susan are able to supply Marco with condensation that has formed inside the TARDIS, saving the group from dying of first.When the group are reunited with Tegana, the travelers begin to suspect he is up to something.
Director: Waris Hussein
Writer: John Lucarotti
Original Airdate: 7 Mar 1964 on BBC
Series: Doctor Who Season 1 Episode 16