The next story in the series is
The Deadly Assassin, which does not have a “monster”, or any aliens other than the Time Lords. In the next story,
The Face of Evil, we have a mad computer, but then we come to
The Robots of Death. Robots, particularly human-shaped ones, have featured several times on the show, but these remain fondly remembered, at least partly for their Art Deco look. They featured in a 1999 novel,
Corpse Marker, by the writer of the original TV story, but it’s really in the audio medium that they have had their greatest success. They have so far appeared in three audios alongside the Doctor, and in two series of their own, one of them reaching eighteen episodes.