Doctor Who: The Invisible Enemy (1977)

When an alien race and factions within Starfleet attempt to take over a planet that has "regenerative" properties, it falls upon Captain Picard and the crew of the Enterprise to defend the planet's people as well as the very ideals upon which the Federation itself was founded.

The "Academy Island Incident" in which four "kings" cross paths... Since then, Silver Clansmen Kuroh Yatogami and Neko have been searching for their master, Shiro. Without finding any clues to Shiro's whereabouts, the two became disheartened. However, one day, they see HOMRA members Rikio Kamamoto and Anna Kushina being chased by someone.

The newly-regenerated Doctor arrives in Victorian London, and Clara Oswald struggles to embrace the man he has become. All the while, they reunite with the Paternoster Gang to investigate a series of combustions that have been occurring all around the city.

After Martha Jones parts company with the Doctor, his TARDIS collides with another, and he comes face to face with one of his previous incarnations.

The Doctor struggles to help the only remaining crewmember of a crashing gunship. The people of the planet below offer to save his life, but at a dear cost to the life he's lived for hundreds of years.

Before the Doctor can settle down to married life, he must face one last confrontation with his deadly enemy of certain death - the Master.

Scientist turned Entrepreneur Dr. Sethuraman tries to safeguard his newly invented time travel device from falling into the hands of his Evil Twin Brother Aathreya.

Husband and wife Nora and Héctor's scientific breakthrough lets them time travel from 1966 to 2025. As Héctor struggles, Nora thrives—but at what cost?

Three friends discover that they have the power to travel back and forth 20 years with a sneeze. However, the future is not as good as they hope, and they need to take on the responsibility of saving the world.

Tom Merrick gets caught up in a time-traveling conspiracy and must set the timeline right before it is irrevocably altered.