Alydon discovered the Doctor's TARDIS in the petrified jungle. He left a case of the Thals' anti-radiation drug for the TARDIS crew and later made contact with Susan, giving her an extra case of the drug and also his cloak. Alydon did not entirely trust the Daleks and gave Susan more drugs in case his people's ancient enemies did not share them with the time travellers as they had promised. His cloak, being made of non-conductive plastic, proved instrumental in the TARDIS crew members' escape from the Daleks, letting them warn the Thals that they were walking into a trap, albeit not before the Thal leader Temmosus was killed.