Doctor Who: An Unearthly Child (1963)

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

The Doctor has retired to 1892 London. Despite the protests of his allies, he is determined to keep out of mankind's affairs. However, a governess named Clara has stumbled upon a plot which only the Doctor can unravel, involving the death of her predecessor in ice and the sinister Dr. Simeon, who controls monsters made of sentient snow. And there is another mystery afoot: Clara is the spitting image of Oswin Oswald, whom the Doctor saw die in the Dalek asylum...

In 2013, something terrible is awakening in London's National Gallery; in 1562, a murderous plot is afoot in Elizabethan England; and somewhere in space an ancient battle reaches its devastating conclusion. All of reality is at stake as the Doctor's own dangerous past comes back to haunt him.

Ba'al travels back in time and prevents the Stargate program from being started. SG-1 must somehow restore history.

The Doctor and Clara face their Last Christmas. Trapped on an Arctic base, under attack from terrifying creatures, who are you going to call? Santa Claus!

After being punished for retreat from combat, Ranger David Martel is given command of the Liandra, a haunted 20-year old Minbari fighting ship. He's escorting ambassadors to a secret archaeological site, the oldest city on record and a clue to a dangerous ancient race.

Amy Pond and Rory Williams are trapped on a crashing space liner, and the only way the Eleventh Doctor can rescue them is to save the soul of a lonely old miser. But is Kazran Sardick, the richest man in Sardicktown, beyond redemption? And what is lurking in the fogs of Christmas Eve?

Hoping to alter the events of the past, a 19th-century inventor instead travels 800,000 years into the future, where he finds mankind divided into two warring races.

After the collapse of Earth's ecosystem, Vesper, a 13-year-old girl struggling to survive with her paralyzed Father, meets a mysterious Woman with a secret that forces Vesper to use her wits, strength and bio-hacking abilities to fight for the possibility of a future.

When a tech blogger lands an interview with a tech guru and stops an attack on him, he finds a mysterious ring that takes him back 57 seconds into the past.