Jackson Lake was introduced in the 2008 Christmas Special as The Next Doctor... except he totally wasn't. Journeying to the now familiar realms of Victorian England, the Tenth Doctor was as shocked and confused as the rest of us when he came across a man claiming to be his future incarnation. Things happened, though, and there was stuff and shenanigans (beautiful word, 'shenanigans'), as it was eventually revealed that Jackson was just an ordinary bloke who'd had his memories warped by a Cyberman's info-stamp. 13 million viewers (Russell T Davies does it again!) and a whole lot of timey-wimey induced headaches later, David Morrissey's guest stint in the series suddenly got a whole lot less interesting (no offence, but a regeneration was basically what the entire nation had tuned in for!) as he entered the reputable realms of Doctor Who's that could've been. But oh, what a Doctor he would have been! He was smart, brave and resourceful (at least, he was in the year 1851) and he even had a fiesty companion, Rosita, and his very own TARDIS to boot. OK, so his 'companion' was a prostitute and his TARDIS was actually a hot air balloon, but desperate times call for desperate measures. He wasn't the next Doctor (or even the next but one), but he was certainly then next best thing. All hail Jackson Lake!