What does "And I'm Susan." mean in English for Spanish?

In English for Spanish, "And I'm Susan." means:

Y yo soy Susan.

Listen to "And I'm Susan.": (If you have an HTML5 enabled browser, you can listen to the native audio below)

This is a phrase that is used in the GamesForLanguage English for Spanish Language Game in the following scenes:

• English for Spanish 3, Level 3, Scene 12