Crossing the Line is sung during the episode Rapunzel's Return after Cassandra reveals she is the biological daughter of Mother Gothel and how she cut ties with Rapunzel and she is determined to create her own destiny to achieve the dreams and glory she's always wanted for herself after her betrayal was revealed.
Rapunzel: This has to stop now
Whatever it is that you're going through
We'll face it together, me and you
Just like we've always done
Cassandra: No! This has to stop now
This thing where you think that you've been my friend
And don't even hear how you condescend
The way you've always done
Rapunzel: Cassandra, listen (I'm listening)
I know it isn't true (Isn't it?)
Just look into my eyes, (Well)
I know you feel it too (Perhaps I do)
Cassandra, listen (I'm listening)
I swear it's not too late
So before another line gets crossed
And everything we've had is lost
Cassandra: No, I won't wait! There's a line between the winners and the losers
There's a line between the chosen and the rest
And I've done the best I could, but I've always known just where we stood
Me here with the luckless, you there with the blessed
And that line between the beggars and the choosers
Is the line you never let me quite ignore
How I tried to jump that great divide, but I've never got the chances you were given
You don't know how much I've been denied, well, I'm not being patient anymore
I'm crossing the line!
And I'm done holding back
So look out, clear the track,
It's my turn!
I'm taking what's mine!
Every drop, every smidge
If I'm burning a bridge,
Let it burn!
But I'm crossing the line!
And for us, if we're over, that's fine!!!
I'm crossing the line!!
- When Cassandra sees herself inside Rapunzel's eyes is similar to the way Wuya is shown inside of Raimundo's eyes at the near of the beginning of the Xiaolin Showdown episode In the Flesh. Plus, the Idol of Vershaftsbezeigungengien can be shown inside Rapunzel's eyes during the episode Happiness Is...
- The way Cassandra points her finger at Rapunzel during the song is similar to the way Raimundo pointed his finger at Omi, Kimiko and Clay during the Xiaolin Showdown episode Days Past.