Serena is a blushing queen around Christopher who she admires greatly as she easily spotted Carlos in the season finale episode Uncovering The Truth Part III.
Serena despises Carlos mainly because of her crush on Christopher which sets the identical agents apart and she hates the fact that he tried to eliminate her crush.
Serena then meets Carlos again but with little time to fight because of an interruption from an enemy ambush in the Tower of Mastery.
Later in the series Carlos teamed up with Shadow to try to bring down The Government but Serena and Christopher successfully thwart them both bringing their attacking attempt down.
- Serena is the first character chronologically to meet Christopher and develop a romantic crush on him.
- Serena is revealed to have a set of weapons from being an ex-spy as she knows about the time she was formerly a spy.
- Serena is the first person to reveal their acrobatic side to her skills while moving about in a rescue attempt during a mission.
- According to the creators of the series Serena has a long childhood history with Christopher explaining her crush on him.