I think The Lazerus Experiment is bad in the worst way possible for any Doctor Who story - it's kind of bland and forgettable, even when it's crummy effects suggest it should be at least a memorable mess. No joke though, I've seen Youtube reviews going over this era of Doctor Who that forgot this episode exists entirely. It's hard to blame them, either. The one nice moment where Doctor and Matha get to dress up fancy (and they both look great doing it) I really like, but that just leads to Mark Gatiss' character announcing his plans to turn into some sort of monster in the pursuit of immortality. That's all the story really has to offer, a pretty cheap take on the science goes wrong motif. It's nice having our characters dressed up for a story and it is cool seeing the very talented Gugu Mbatha-Raw in an early role in her career, but that's literally about all the entire episode has on offer. The CGI monster looks *so* bad and the story really doesn't do much of interest with him.

This is part of a really rough run of Series 3 episodes, made up for by the fact that it is followed by one of the best runs of Doctor Who episodes in the franchise's history.