Clover

Clover is the main character in Totally Spies!, along with her best friends and fellow spies Sam and Alex. Clover is pretty much like any typical teenager, having an eye for fashion, an obsession for shopping, and actively seeking for cute boys.

Model Citizens
Season 1, Episode 9 Airdate: January 12, 2002

Clover is put into a machine that switches her normal legs with large, bulky, muscular legs. The weight of them causes her to run much slower, but does help press down heavy buttons and pin down enemies.

It's How You Play The Game
Season 2, Episode 5 Airdate: August 18, 2003

The spies investigate the Winter Olympics, where the Zanzibar team's coach is using micro-organisms to make his athletes far better at the events. After being captured, the coach forces Clover to replace their female figure skater, and is given three performance-enhancing bugs (instead of the usual one given to the other athletes in the episode).

As a result, Clover not only becomes a super-athlete at figure skating, but she also gains a lot of muscle mass and strength. When Alex tries to stop her, she can't. She returns to her normal size when Alex remembers that Clover was allergic to daffodils and uses them to make her sneeze the bugs out.