"O! Call Back Yesterday!": The Legion learns that Superboy has the mind of Ultra Boy, and several members head back to the 20th Century with him to learn the answer to the mystery.

Legion of Super-Heroes (Volume 2) #280 is an issue of the series Legion of Super-Heroes (Volume 2) with a cover date of October, 1981. It was published on July 23, 1981.

Synopsis for "O! Call Back Yesterday!"

The Legion learns that Superboy has the mind of Ultra Boy, and several members head back to the 20th Century with him to learn the answer to the mystery.

Appearing in "O! Call Back Yesterday!"

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