Doctor Who: 10 Storylines That Will Never Be Revisited

8. Adam And His Alien Forehead

Doctor Who Adam Mitchell
BBC Studios

Adam was a short-lived companion of the Ninth Doctor, first appearing in the brilliant Dalek as a computer whiz who ended up battling the titular villain with the Doctor and Rose. He then joined them for one more trip, before vanishing from the show entirely.

However, he wasn't killed, erased from time, or anything of the sort: he was left behind by the Doctor. After Adam installed some alien tech inside his own head, he almost gave the sinister Jagrafess control of the TARDIS, which, naturally, didn't sit well with the Doctor, who angrily left Adam at home.

And this is the last we saw of him on the TV screen. Under ordinary circumstances, his lack of additional appearances wouldn't really be noteworthy, but at the end of his last episode, Adam's forehead-hole is accidentally discovered by his mother, since it's revealed with a simple click of the fingers.

The point is, there's no way that Adam could live a normal life with this alien tech inside him, and the fact that the Doctor just left this potential danger on Earth is actually quite weird. Adam might want revenge against the Doctor for leaving him behind, and this tech might even give him the means to do it. But, strangely, we never heard a peep from him again.

He did pop up in some comics (where he actually got a redemption arc), but like we mentioned in our introduction, these have not been labelled as canon by the BBC.

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Danny has been with WhatCulture for over ten years, and is currently Doctor Who Editor and WhoCulture Channel Manager, overseeing all of WhatCulture's Whoniverse coverage. In 2022, he took charge of WhoCulture and has grown it into the biggest Doctor Who channel on YouTube, and one of the biggest Doctor Who communities on the web full-stop. He has been writing and video editing since his early teens, and first got a taste for content creation after making his own Doctor Who trailers, off the back of a burning obsession with the Matt Smith era of the show. Like many his age, he first got into Doctor Who with the 2005 revival, but has since gone back and fallen in love with the classic years too. If you need someone to recite every Doctor Who episode in order, or to give you a random factoid about the making of Gridlock, Danny is the person to ask!