Doctor Who: The Newbies Guide
Revelation of the Daleks
This is the sixth and final story of Season 22.
The sixth Doctor is brash, stubborn, and often condescending and arrogant. He wears a bright multi-coloured coat.
Perpugilliam "Peri" Brown is an American botany student from the 1980s who decided to join the Doctor on his travels during Planet of Fire. In The Caves of Androzani, the fifth Doctor sacrificed himself to save her life. She stayed with the newly regenerated Doctor in The Twin Dilemma despite post-regeneration trauma that led him to attempt to strangle her.
Recurring and Historical Characters
The Daleks are a race of evil mutants encased in powerful cyborg bodies whose shape is reminiscent of pepperpots. The Doctor has fought them many times, first encountering them on in a city on their home planet of Skaro in The Daleks. The Doctor considers the Daleks his greatest enemy and they are a serious threat to anyone they encounter.
Davros is the scientist who created the Daleks. In Genesis of the Daleks he foresaw how his race, the Kaleds, would evolve as a result of the radioactive damage their war with the Thals would cause. He engineered this mutated form, altering their emotions to feel hatred for anything that wasn't like them. He also put them into Mark 2 travel machines, which were the earliest form of the Daleks' exterior casing. In Destiny of the Daleks the Daleks recovered him from the bunker in which he had been entombed for centuries. He was last seen in Resurrection of the Daleks.
Some people might like to see Davros's previous appearances (Genesis of the Daleks, Destiny of the Daleks, and Resurrection of the Daleks) to get a better idea of who Davros is and what kind of relationship he has with his creations. But as long as you know who he is you'll have no problem at all following the plot.