The Backstory Trio

The Backstory Trio are three episodes in Sem 2.10. Each of the episodes reveal the backstory of each of the main characters. While much of Sem's history isn't learned, Danic's and Xion's past is actually revealed.

Sem's Backstory (DNAtrix Rising)
Sem's backstory is the first episode of The Backstory Trio. Hyjinx is out for revenge, and the gang end up fighting him on the exact place Sem found the DNAtrix, which brings back memories to Sem, so he thinks of the events while fighting Hyjinx.

Danic's Backstory (Of Metal and Flames)
Danic's backstory is the second episode of The Backstory Trio. Danic wants to find out about her Biosovortian and Pyronite roots, so the gang travels to Pyros and Electrona to find out about Danic's past.

Xion's Backstory (Xion and the Temple of Xenon)
Xion's backstory is the third and final episode of The Backstory Trio. Xion is in a depression because he just heard his old partner Owen just got badly hurt. This reminds Xion about his childhood on Xenon, and shares it with the gang.

Trivia

 * Xion and the Temple of Xenon was originally going to be called It Wasn't Easy being Xion.