Not good enough to get five stars, but still pretty damn good. I think Peter Davison's Doctor was even better in this one than in a lot of his other stories. Don't get me wrong. I liked Davison's Doctor, but in this one in particular, he's just great. Better than in his premiere story. I think the reason why I like him better in this one is because he reminds me of a younger and more energetic Tom Baker. Much as he did in "Kinda", "The Visitation", "Earthshock", and "The Caves of Androzani". The Doctor uses his sonic screwdriver more in this one, which is a nice thing to see considering that not long from now we won't see it again until the 1996 TV movie. And when they started using it in the new series, they used it way too much.
I haven't seen this one in a while, but that's just because I watched it so much when I first got it on VHS. It is a good one. The story is great. So are all the cliffhangers in it. The special effects are reasonably good, the spaceship was nice looking - both inside and out, lots of excitement, the music was great, and so was the acting. I recommend this one to anyone who has an interest in "Doctor Who". Oh, and by the way, Nyssa collapses at the end leaving you hanging. Let me tell you why she collapsed so you won't have to see the next story, which is not yet on DVD. She was just suffering from extreme exhaustion. She'll be fine.