Description:  Johnny Cypher in Dimension Zero is an American animated science-fiction series from the late 1960s about a brilliant scientist named Johnny Cypher who gains superhuman powers to travel through space and time using an interdimensional "Dimension Zero". He uses his powers, with the help of his assistant Zena and a Martian named Rhom, to protect Earth from various threats that appear across different dimensions and time periods. The series is known for blending American superhero tropes with early Japanese anime-style animation.

The Protagonist: Dr. Johnny Cypher, a brilliant scientist who uses his powers to protect Earth from interstellar and interdimensional threats.

His Powers: Cypher can travel through space and time by using "Dimension Zero," an artificial interphase between continuums that gives him superhuman abilities. The origin of these powers is never explained.

His Companions: He is aided by his beautiful assistant, Zena, and a friendly Martian named Rhom.

The Plot: The team patrols from a satellite above Earth, warding off alien attacks and other threats that plague various planets and time periods. Each episode features an adventure, such as stopping a gigantic creature, getting trapped in a prehistoric world, or being captured by an ancient Roman emperor.