• Batman ^[1]
• Robin ^[2]

“The Dynamic Duo” is a nickname for the superhero team, Batman and Robin.  The relationship between Batman and Robin was spoofed in “The Ambiguously Gay Duo ^[3],” a series of shorts that appeared on “Saturday Night Live ^[4].”

Unlike other Numbered Nicknames, such as “Fab Four ^[5],” it is most commonly used not to refer to its original grouping—in this case Batman and Robin—but as a nickname for groupings in other fields:

• “The challenge for Governor Cellucci and Mayor Menino is to do it again — to be affordable housing’s dynamic duo, battling excessive rents to help families stay in their homes.”—unsigned editorial, “Young people at work,” The Boston Globe ^[6], August 19, 1999
• “Kobe Bryant dazzled the New York Knicks with an array of drives, jumpers and dunks, scoring 46 points to lead the Los Angeles Lakers to a 114-109 victory last night and their first winning record of the season heading into the all-star break. Shaquille O’Neal added 33 as the Knicks had no answer for Los Angeles’ dynamic duo. Bryant (40) and O’Neal (28) combined to outscore the Knicks in the first three quarters as the Lakers took a 97-67 lead at Madison Square Garden.”—Associated Press, “Lakers’ Bryant Does It All in N.Y.,” The Washington Post ^[7], February 7, 2003, p. D06
• “You’d think spending their entire working lives together would be enough for Merrick Watts (pictured) and Tim ‘Rosso’ Ross, but the dynamic duo just can’t seem to get enough of each other. The Nova 96.9 funnymen have even spent part of their holidays together, enjoying New Year’s Eve with their partners and some pals in South Australia. But the Sydney-based comedians have finally parted ways, with Ross flying out of the City of Churches midweek, leaving Watts to lunch with other buddies at Penny’s Hill Winery near McLaren Vale yesterday.”—Holly Byrnes, Sarah Grant, and Angela Saurine, “Sydney Confidential,” The Daily Telegraph (Australia) ^[8], January 5, 2008
• “Dynamic duo, gruesome twosome or just plain geeks in ties and tweeds, the British artists Gilbert & George ^[9] don’t seem to care what you call them as long as you pay attention, which you couldn’t avoid doing if you tried in their suffocating and disordered wraparound survey at the Brooklyn Museum.”—Holland Cotter, “Provocative Duo, Naked and Natty ^[10],” The New York Times ^[11], October 2, 2008
• “A pair of rovers that were supposed to survive the harsh Mars environs for a mere 90 days celebrated the five-year anniversary of their landing over the weekend. Together, the dynamic duo – Spirit and Opportunity – has taken a quarter million photographs, explored more than 13 miles of Martian terrain and climbed courageously out of myriad sand traps.”—Meredith Kolodner, “Rover & Out on Mars? No Way!” The New York Daily News ^[12], January 5, 2009