The Ace Arc 
--A trilogy of stories centering around the character of Ace--

Ghostlight (VHS | DVD)
The Curse of Fenric (VHS | DVD)
Survival (VHS | DVD)

The Black Guardian Arc 
--A trilogy of stories featuring the Black Guardian's attempts to humiliate and kill the Doctor--

Mawdryn Undead (VHS | DVD)
Terminus (VHS | DVD)
Enlightenment (VHS | DVD)

The Davros Arc 
--Loosely chronicling Davros' attempts to control his Daleks--

Genesis of the Daleks (VHS | DVD)
Destiny of the Daleks (VHS | DVD)
Resurrection of the Daleks (VHS | DVD)
Revelation of the Daleks (VHS | DVD)
Remembrance of the Daleks (VHS | DVD)

The E-Space Arc 
--A trilogy of stories highlighting the Doctor's adventures in E-Space--

Full Circle (VHS| DVD)
State of Decay (VHS | DVD)
Warriors' Gate (VHS | DVD)

Exiled on Earth Arc  
--Beginning with the Doctor's capture and trial in "War Games" and following through all of his adventures while exiled on Earth (with one or two side trips to other planets) until his pardon in "The Three Doctors"--

The War Games (VHS | DVD)
Spearhead from Space (VHS | DVD)
Doctor Who and the Silurians (VHS | DVD)
The Ambassadors of Death (VHS | DVD)
Inferno (VHS | DVD)
Terror of the Autons (VHS | DVD)
The Mind of Evil (VHS | DVD)
The Claws of Axos (VHS | DVD)
Colony in Space (VHS | DVD) - only briefly on Earth
The Daemons (VHS | DVD)
Day of the Daleks (VHS | DVD)
The Curse of Peladon (VHS | DVD) - only briefly on Earth
The Sea Devils (VHS | DVD) 
The Mutants (VHS | DVD) - only briefly on Earth
The Time Monster (VHS | DVD)
The Three Doctors (VHS | DVD)

The Key to Time Arc 
--An entire season devoted to the Doctor's quest for the six segments to the Key of Time--

The Ribos Operation (VHS | DVD)
The Pirate Planet (VHS | DVD)
The Stones of Blood (VHS | DVD)
The Androids of Tara (VHS | DVD)
The Power of Kroll (VHS | DVD)
The Armageddon Factor (VHS | DVD)

The Master's Dalek Plan Arc
--Two stories loosely connected by the Master in "Frontier" and the Daleks in "Planet."--

Frontier in Space (VHS | DVD)
Planet of the Daleks (VHS | DVD)

The Master's Return Arc
--A trilogy of stories centering around the Master's return to the series--

The Keeper of Traken (VHS | DVD)
Logopolis (VHS | DVD)
Castrovalva (VHS | DVD)

Metabelis 3 Arc 
--Mentioned briefly in "Carnival" but much more dominant in "Green Death" and "Spiders"--

Carnival of Monsters (VHS | DVD)
The Green Death (VHS | DVD)
Planet of the Spiders (VHS | DVD)

Space Station Nerva Arc 
--A loose collection of stories that begin on Space Station Nerva, a detour to Skaro, back again to the station (only this time in the past), and then on to Earth--

The Ark in Space (VHS | DVD)
The Sontaran Experiment (VHS | DVD)
Genesis of the Daleks (VHS | DVD)
Revenge of the Cybermen (VHS | DVD)
Terror of the Zygons (VHS | DVD)