In season 9 of Smallville, the Superman prequel series introduced live-action versions of DC's Wonder Twins for the first time. Similar to Harley Quinn, the Wonder Twins are DC characters that didn't originate in the comics. They debuted in ABC's The All-New Super Friends Hour, an animated series based on characters from DC Comics. The team included Superman, Batman, Robin, Wonder Woman, Aquaman, and two original heroes, the Wonder Twins, who were accompanied by their pet space monkey and sidekick, Gleek, who was often a source of comic relief.
In Super Friends, the Wonder Twins are Zan and Jayna, a brother-and-sister superhero duo garbed in matching purple costumes. The two have shapeshifting abilities that have aided the Super Friends in many of their adventures. Dan can transform into water, while Jayna can take on the form of any animal, whether it be real or mythological. The catch to their powers is that they have to touch and say the words, "Wonder Twin powers, activate!"
In Smallville season 9, episode 8, titled "Idol", Clark (Tom Welling) finds trouble when he meets Zan (David Gallagher) and Jayna (Allison Scagliotti), two amateur vigilantes who take it upon themselves to imitate the heroics of Clark's superhero persona, the Blur. The problem is that they make too many mistakes, and risk ruining Clark's image. Clark ends up stopping them, and eventually teaming up with them. After encounters with Clark and Chloe (Allison Mack), Zan and Jayna understand more about what it means to be superheroes. At the end of the episode, the two leave Metropolis to forge their own legacies. They never return in the show, but they do appear in the Smallville Season 11 comic.
There's a reason why Smallville treated the Wonder Twins as incompetent heroes. For decades, fans have mocked the Wonder Twins for the nature of their powers, among other things, so it makes sense that Smallville doesn't try to take them too seriously. Instead, Smallville has fun with the characters and doesn't hold back on the silliness.
Smallville's take on the Wonder Twins doesn't include their costumes, but does find a way to incorporate their purple color scheme, and several other nods to the Super Friends characters. Zan and Jayna share the same power set as their Super Friends and comic book counterparts, and they even say the famous phrase, "powers activate" while doing a fist-bump. Gleek gets a fun reference as well, as his picture is seen on their phones, and his laugh from Super Friends is used as their ringtone.