My Sister! Tricera Roars is the twenty-fifth episode of Zoids: Wild. It first aired in Japan on December 22, 2018.
Following on from the last episode, the team want to try help Gyoza get medicine for his sister, Rayu. Death Metal had been controlling supply and charging monopolistic prices for it.
Eventually Goyza sneaks out and decides to break in to the Death Metal warehouse where Truffle, one of the four kings, had stored the medicine.
Arashi and Penne meet up with him, leaving Onigiri with Rayu.
However, the three of them are ambushed by Truffle and his Stegosage.
He opens by using the Stegosage's Death Blast. Penne and Arashi respond by using their Wild Blasts in return.
During the fight, much of the medicine is destroyed, and Truffle states that the problem isn't an illness, but rather with the air in the town. Gyoza doesn't need medicine to treat his sister, he just needs to get her away from the town (which they were doing anyway).
Gyoza unleashes his Wild Blast and tackles the Stegosage, and the three run for it. Truffle follows, but is cut off by a herd of cattle, farmers who had their money taken from the previous episode helped out.
After they are free, Gyoza is convinced by his sister to part ways with her and go with team Freedom to chase his dream (and the Ancient Treasure Z). She goes with Sanratan to a place where the air is clean and Death Metal aren't a threat.
Arashi finally gives Gyoza a Freedom badge, and this time he accepts.
A short post-credit scene shows the silhouette of the Hunter Wolf, an new Zoid not yet seen.