Release Message:  The Doctor (William Hartnell) and Susan (Carole Ann Ford) are able to supply Marco with condensation that has formed inside the TARDIS, saving the group from dying of thirst.

Description:  The Doctor and Susan are able to supply Marco with condensation that has formed inside the TARDIS, saving the group from dying of thirst. When the group are reunited with Tegana, the travelers begin to suspect he is up to something.