Little sisters are the worst.

When twelve-year-old Gregory Hernandez wishes his annoying sister would disappear, a Gladiator Star grants his wish. He tries to cancel, but there are no takebacksies in alien lingo. Next thing he knows, his living room is turned into an intergalactic gladiator ring, and he's got to fight warrior aliens in three challenges to get his sister back before his parents get home or he’s grounded for life.

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