Booster Gold and Blue Beetle come to Smallville in the April 22 episode. The episode is written by Geoff Johns and directed by Tom Welling. Here's the official description from The CW:
dC cOMICS CHARACTER BOOSTER GOLD ARRIVES FROM the FUTURE; The BLUE BEETLE IS BORN! — After everything that happened with the VRA, Lois (Erica Durance) tells Clark (Tom Welling) it’s best to make “Clark Kent” forgettable and awkward so people don’t suspect he’s The Blur. However, the two are stunned when a fame-hungry superhero from the future, Booster Gold (guest star Eric Martsolf, “Days of Our Lives”), sweeps into town and begins making saves and posing for press ops, completely winning over the city of Metropolis. Booster begins his campaign to take The Blur’s place as the “World’s Greatest Superhero” and tries to charm Lois into writing a story about him, but she’s not having his antics and begins her own campaign for The Blur. During one of Booster’s saves, an alien weapon in the form of a scarab falls from a truck and fuses itself to a boy named Jaime Reyes (guest star Jaren Brandt Bartlett), turning him into the Blue Beetle. Unfortunately, Jaime is unable to control the suit and Blue Beetle starts attacking Metropolis. Tom Welling directed the episode written by Geoff Johns (#3X6019).
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The CW's Official Description For "Booster"