Spring 1965 Anime

Invited to Nazi Germany during World War II, Dr. Asagumo is asked by Hitler to collaborate with him on the research of the new weapon "Big X". Concerned about the possible effects of the completion of Big X, Dr. Asagumo intentionally delays the progress of the research, conspiring with his co-researcher, the devious Dr. Engel. Immediately before Germany is defeated by the Allies, Dr. Asagumo implants a card inscribed with the secret of Big X in his son, Shigeru, and is then shot to death by the German army. Twenty years later, the card is discovered in the body of Shigeru, who is then living in Tokyo. Soon, an organization claiming alliance with the Nazis appears, steals the card, and completes the Big X project. Dr. Engel's grandson has joined the Nazi Alliance. The completed Big X is then revealed to be a drug that can expand the human body without limitation. Recovering Big X from the enemy, Shigeru's son Akira fearlessly challenges the Nazi Alliance and Hans Engel, who are plotting to conquer the world.

[Source: Wikipedia]

A time patroller from the 30th century goes back to the 20th century to stop a meteor from destroying the world.

[Source: MyAnimeList]

Produced as a short experimental trial series of only 3 episodes and filmed in black and white. Inspired in part by the novel "Deep Range" by Arthur C. Clarke, the tale of an undersea boy (Dolphin Prince) with a pet dolphin, who swam in a wetsuit with a built-in jetpack and stunned his enemies with an aqua-boomerang. The episodes featured his mermaid friend Neptuna and Dr. Mariner, with stories entitled "Secret Of The Red Vortex", "Call Of The Sea" and "Attack Of The Sea-Star People."

[Source: Wikipedia and The Anime Encyclopedia]

Dr. Tatsunoko of Tatsunoko Research Center goes undersea accompanied by his daughter Asari to inquire into some mysterious radiation and discovers there a giant shell and it is known that the radiation comes from a globe laid inside the shell. Then Asari finds an object in the shape of compact with a message in it. It says that a space alien from the Planet of Parlum which is on the verge of extinction is lying in the globe. Suddenly a boy with a strange look appears out of the globe and goes wild. He is the very person mentioned in the message with the name of Ace. His source of energy for superhuman power is what is called space food and he can fly with the help of Silver Ring made with energy collected instantly in the aerial environment. Also he is able to use it as a weapon to fight the enemy with. Supported by his friends including Asari, Ibo the robot dog, and Hermit Crab Reporter, he gallantly goes into action to settle various difficulties caused by mystic robots and brutal space invaders.

[Source: MyAnimeList]