There is Planet Earth, Father! Frieza and King Cold Strike Back!

is the fifty-fifth episode of Dragon Ball Z Kai. This episode first aired in Japan on May 2, 2010. Its original American airdate was February 17, 2011.
==Summary==
It has been a year since Goku defeated Frieza. To make sure he is studying, Chi-Chi walks in to check in on Gohan, who is wondering when his father will return home. Vegeta returns from space but is displeased that Goku isn’t there. Bulma suggests that he stay at her house until Goku returns. As he’s studying, Gohan senses a violent ki. That ki’s identity is… Frieza?! Gohan rushes to where Frieza and the other ki are. The other warriors have gathered, but Goku is nowhere to be seen. Frieza appears with his father King Cold. Frieza was left on the brink of death after his battle with Goku, and once King Cold's Spaceship saved him as he drifted through space, he was revived by becoming a cyborg. Frieza orders his underlings to kill all the Earthlings until Goku's arrival. But a boy mysteriously appears and instantly cuts down Frieza's underlings.
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