Creator of the Feynman Sprinkler (Feynman Paradox): Which way does a sprinkler rotate when submerged in a tank and made to suck in the surrounding fluid?

Jamie (Frazer Hines) sabotages the Wheel's x-ray laser, unknowingly giving the Cybermen an opportunity to reach the Wheel.

Chris tries to convince the sisters to come up with a plan to vanquish the titans but they feel discouraged without Leo who, Piper (Holly Marie Combs) realizes, is becoming an elder.

When the Doctor (Matt Smith), Clara, Artie and Angie arrive at Hedgewick's World of Wonders, the last thing they expect is the re-emergence of one of the Doctor's oldest foes, The Cybermen.

Traveled as Derek in the video series The Greatest Adventure Stories From The Bible (1985-1989), as Launchpad McQuack in the TV series Duck Tales (1987-1990) and Darkwing Duck (1991-1995), and the video game Carmen Sandiego's Great Chase Through Time (1999)

Phoebe (Alyssa Milano) and her sisters are visited by a white lighter from the future: Chris Perry, who informs them that a new threat, the Titans, have been awakened.

Luc and Theo (Kevin Duhaney) become famous musicians.

When the ancient continent of Mu sank beneath the ocean, some of its inhabitant survived in caverns beneath the sea. Cowboy singer Gene Autry stumbles upon the civilization, now buried beneath his own Radio Ranch.

An imprisoned vampire, Barnabas Collins (Johnny Depp), is set free and returns to his ancestral home, where his dysfunctional descendants are in need of his protection.

Fyootch's newfound love derails a planned road trip. Future-Worm loses his body...and Zarlid gets it! Steak poses as the Intergalactic President to prevent war. Featuring Maurice LaMarche as the General.

Lupton forms an alliance with the spider to steal the Doctor (Jon Pertwee)'s blue crystal, while Sarah and Mike attempt to alert people to what they've seen.

Ian (Thorsten Kaye) and Eve travel back in time thanks to the morca root.

Traveled in the TV series First Night episode "The Road" (1963)

Newlywed Alex Walker finds himself being pulled back to his childhood and back to his widowed mother in the house where he grew up. Created by Rod Serling

After being forced to retire, Professor Fowler (Donald Pleasence) contemplates suicide when he doesn't feel he has made a difference in the world. That night he has an experience that shows him that he is wrong.

When Zelena's time portal re-opens and sends Emma and Hook (Colin O'Donoghue) into the Enchanted Forest of the past, their actions have dire consequences for the future.

Kyon and Mikuru accompany Haruhi (Aya Hirano) as she negotiates with shop owners for free equipment, obtaining an expensive camcorder and an airsoft gun.

Luc (Lyon Smith) and Theo discover that Lester has a secret life, role playing with aliens.

Traveled in the TV series Krystala (2004)

Traveled in the film La Edad de Piedra (1964)

Traveled in the TV series Time Express episode "Garbage Man / Doctor's Wife" (1979), the Tales From the Darkside episode "The Devil's Advocate" (1985), and the Fish Hooks episode "The Tale of Sir Oscar Fish" (2010)

Wrote the short story "The Oldest Worship in the World: A Restoration" (1897)

Traveled in the films The Land That Time Forgot (1975), and The People That Time Forgot (1977) and the TV series Out Of This World episode "Evie's Magic Touch" (1990)

Traveled in the TV series Noein: M™ hitori no kimi he "To Your Other Self" (2005Ð06)

Preparation for the SOS Brigade's short film continues, with the main character's roles eerily matching their actual nature. Starring Aya Hirano as Haruhi.

Emma (Jennifer Morrison) and Hook attempt to rectify the mistakes they made in the Enchanted Forest of the past and find their way back to Storybrooke in the present.

After Alex (Keeley Hawes) and Hunt bug Mackintosh's office for evidence of his corruption they are visited by Jackie Queen, Hunt's journalist old flame .

Wrote the novels Hitchhiker's Guide To The Galaxy (1978) and The LIfe, The Universe, and Everything (1982), numerous episodes of the TV series Doctor Who (1978-1979), and the TV series The Hitchhikers Guide To The Galaxy (1981) and Dirk Gently (2010)

Traveled in the lead role in the TV series Superboy (1989-1992)

The lab members discuss how to perfect the Mobile Microwave, dubbing messages sent to the past as 'D-Mails'. Starring Mamoru Miyano as Okabe.

A film projectionist (Buster Keaton) longs to be a detective, and puts his meagre skills to work when he is framed by a rival for stealing his girlfriend's father's pocketwatch.