Melaktha is written ridiculously out-of-character here (it's almost surprising that David Wise didn't write the episode). He is portrayed as the fool of the episode, making himself sound an idiot with each line, and it does not seem like him at all to jump to conclusions about Stanlin in the way he does here. It completely contradicts the sensible, wise personality he displayed in previous episodes.
To flaw his character even further, Melaktha is ridiculously over-afraid of the fire in the cave. He almost shrinks from it with fear, which is not right for him, especially as he's an archaeological explorer!
Teela: In today's adventure we saw what happens when we make up our minds about something before we have the facts. It's called jumping to conclusions. And anyone who does will usually find that the conclusion is wrong. That's what happened to Melaktha. If he'd only--Well, hello Holly! Is there something you want to say?
Hollywag: Yup! Don't jump to conclusions. Don't jump to conclusions.
Teela: That's good advice. And if anyone asks, just say a little bird told you. See you all soon.
Cringer: There are two things I'm not scared of...eating and sleeping!!
This is the only appearance of Melaktha's assistant Stanlin besides the "House of Shokoti" two-parter.