It's not the most forgettable episode of the revival (more on that next week), but it's close.

It's not bad, really, but the plot is so threadbare that Lazarus being hauled away in the ambulance seems like a natural end point, even though there's a fair bit of episode remaining.

It's a really good Martha episode, though. She gets to be a scientist, she gets to be a doctor, she gets to be an action hero, and she gets to grow a backbone and stand up to the doctor. As a resolution to the "unrequited love" angle, it's quite effective.

It's a pretty bad Tish episode, though. Showing her standing up to the creepy advances of her wealthy and powerful boss, only to become willing to acquiesce to them once he's younger was...certainly a choice that they made. Some twenty years later, it's hard to imagine that they ever would go that route were they to make it today. It doesn't help that Mark Gatiss does not have the magnetic charisma required for this to be remotely believable.

The episode also kicks the Harold Saxon arc into high gear. It's interesting that the Master has an interest in Lazarus's work - I suppose it must have something to do with the Toclafane, but I can't remember if that's ever made explicit. I never noticed before that the logo of Lazarus's company is clearly (incomplete) Gallifreyan script, which is neat. I don't think you can call it foreshadowing, because I don't think we've seen Gallifreyan script at all before now, but the wiki tells me the same logo is later seen in the Master's ring, with the missing bits filled in.

And of course, it must be said that this episode has some of the dodgiest CGI of the series so far. They probably would have been better off with a puppet. It's also odd that they didn't seem to model the creature after Mark Gatiss at all (or if they did, they missed the mark quite badly).