[1] A story about Vikings, Voltar was first published in the Philippines by CRAF Publications, a comic book company established by Alcala himself, together with other colleagues in the field of comics such as Virgilio Redondo, Nestor Redondo, Amado Castrillo, and Tony Caravana, among others.

Thomas as "brilliant for 1963" because it was done seven years before any actual illustration of Conan the Barbarian as a character in comics existed.

The brush used to ink many Voltar pages was a special fountain-brush invented by Alcala, thus making the series even more noteworthy.

"[7] Jundis declared Voltar as "one of the earliest epic comic book series to result from a single creator's vision".

[6] Voltar was further regarded by the World Encyclopedia of Comics as "an antonishing display of sustained artistic endeavor" because "[e]very chapter contains a spectacular center spread.