Whoa, deja vu! Didn't we cover this already...? Well, yes and no. In this episode, Andrew and Sarah revisit the 'companion question'- who is a companion, and who is just a frequent guest star? In the unusual eras of Pertwee's Earth Exile and the New Series and its specials... what does it take to join the hallowed ranks? Who makes the cut, who doesn't, and why? Plus, a wretched monkey.