Formulated the Nikodym set in 1927 - a seemingly paradoxical result of a construction in measure theory. A Nikodym set in the unit square S in the Euclidean plane E2 is a subset N of S such that the area (i.e. two-dimensional Lebesgue measure) of N is 1, and for every point x of N, there is a straight line through x that meets N only at x. Of course!

Traveled in the TV series Dimension 404 episode "Chronos" (2017)

Wrote and directed the films Epsilon (1997) and De. Plonk (2007)

Traveled as Penfold in the TV series Danger Mouse episodes "150 Million Years Lost", "The Planet of the Cats", Demon's Aren't Dull" (1983), "Once Upon a Timeslip..." (1984), and the Hickory Dickory Dock Dilemma" (1985)

Mojo Jojo (Roger Jackson) uses the Professor's time machine to go back and prevent him from getting into science at all costs. But Blossom, Bubbles and Buttercup also go back in time and are hot on Mojo's trail.

Will Fyootch be able to prevent the Mecha-Muck Wars? Bug must overcome her fear of spiders. Danny and Fyootch order a magical hot dog. Featuring John DiMaggio as Slam and the Spiderian Warrior.

Traveled in numerous TV series episodes including as Huey, Dewey and Louie in DuckTales (1987-1988), as Gonzo in Muppet Babies (1989-1990), as Widget in Widget The World Watcher episode "Time Trippers" (1991), The Simpsons (1993-2008), and as Minnie in Mickey Mouse Clubhouse (2006), the TV movie A Flintstones Christmas Carol (1994), and the videos Mickey's Once Upon A Christmas (1999) and Cinderella III: A Twist In Time (2007)

A Neuro who can see the future warns Jane (Kristanna Loken) and the team of their impending death on the day they arrest him.

Alex (Keeley Hawes) hears that young Hales has died in prison, endorsing her conspiracy theory, and when Mackintosh wants the case closed even Hunt starts to agree with her. Featuring David Bradley as Robin Elliot.

Author of the novels The Phoenix and the Carpet (1904), The Story of the Amulet (1906), The House of Arden (1908), and Harding's Luck (1909),

The Doctor and Jamie (Frazer Hines) are brought aboard the Wheel where Jamie is horrified to learn the crew plan to destroy the Silver Carrier with the TARDIS on board.

Traveled in the film Ghost Story (1974)

The Doctor and Clara (Jenna Coleman) arrive in 19th century Yorkshire where moral crusader Mrs .Gillyflower is recruiting beautiful people for her idyllic garden city.

Luc (Lyon Smith) tries to get the high score on a video game.

Traveled in the TV series Mentors episode "Transition" (2004)

Sun Woo (Lee Jin-wook) begins to self-destruct after he finds it too difficult to deal with the changes he brought on by altering the past.

The loop continues for the 15,532nd time, but as Haruhi (Aya Hirano) leaves on August 30, Kyon beckons the SOS Brigade to finish their summer homework together.

Two female friends poison a sadistic blackmailer, then while fleeing happen upon an isolated house containing a time machine. Starring Vera Miles.

Many have wondered whether they live in the right time. Starring Erhart Hartmann as Kupetzky who travels through space and time in a bizarre universe, following his vocation to help people in need.

The loop continues for the 15,527th time. The scene where Kyon (Tomokazu Sugita) answers Haruhi's call loops twice.

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.

As Okabe (Mamoru Miyano) and Kurisu arrive home with the IBN-5100, Suzuha seems to be shocked when she sees Kurisu.

Traveled in the TV series Wansapanataym episode "Aurora's Oras" (2011)

While the Doctor (Jon Pertwee) carries out an investigation into ESP, Mike Yates asks Sarah to look into some strange goings on at a meditation centre he's attending.

Hosted the Bell Science film About Time (1962), and read "A Christmas Carol" on PBS station KCET (1965)

All of the residents of Storybrooke try to make sure Zelena (Rebecca Mader) doesn't get Snow's newborn baby, which is very close to arriving, because Zelena plans to use the baby to travel back in time and rewrite her destiny, while obliterating Regina from existence.

Grieving father, Jacob Lazar (C. James Roberts) connects with an alien visitor stranded on Earth. But Jacob tests their bond when he seizes the being's magical staff with the intent of traveling back in time and saving his son's life.

Traveled in the films Turn Back The Clock (1933), and The Three Stooges Meet Hercules (1962)

After almost being hit by lightning, Miley (Miley Cyrus) gets a vision of seeing her mom, Brooke Shields and her dad back in the day. Miley then figures out she has to make her parents meet or else she risks never being born.

Wrote numerous comic book adventures, including the All Star Comics #35 Justice Society of America story "The Day That Dropped Out of Time" (1947)

The town of Arcadia is in a state of chaos when the return of the deceased reaches a critical mass. Featuring Kurtwood Smith as Henry.

Luc goes crazy with some anti-aging cream and Theo (Kevin Duhaney) reverts back into the form of a baby.