|6 - "Earth's Guardians"|
|Billy Treacy (Agent Liam)|
Harry Williams (Ben)
Sebby Treacy (Dan)
|Guest Cast||Matt Williams (Bob the Flower Alien)|
Christopher Thomson (Agency Representative)
Sebby Treacy (Zakatron #1)
Billy Treacy (Zakatron #2)
|Series||Time Agent: 2009 Specials|
|Broadcast||20 February 2009|
|Preceded by||"Dark Revelations"|
|Followed by||"Memoirs of the Lost"|
"Earth's Guardian" is the first episode of the 2009 specials from the British science fiction YouTube fan series Time Agent.
Liam has disappeared completely, meaning Dan and Ben have to defend the Earth against the almighty Zakatrons without him...
This was the first episode in which Liam talks about the fact that he was the Doctor's final companion.