The Doctor and Vicki arrive in Rome, Barbara is sold to be a slave in Nero's household and Ian is shipwrecked.
As you can tell by the plot description, a lot happens in "All Roads Lead to Rome". I preferred the opening episode, but this is still a good episode. William Hartnell continues to delight, and has a wonderfully unexpected fight scene with the assassin at the beginning of the episode. Derek Francis appears as Nero for the first time at the end of the episode. Although it's a brief bit, his scene with Hartnell and Maureen O'Brien is wonderful.
Ian has become a galley slave, but is soon shipwrecked with his newfound friend Delos. The shipwreck is well executed in the studio, with lots of water being thrown on the actors. Barbara has the least interesting storyline, but the bit where she kicks a lecherous slave buyer is a nice character moment. You go Babs!