Hueco Mundo arc[]
Tesla makes his first appearance shortly after his master Nnoitra easily disposes of the weakened Yasutora Sado. He asks Nnoitra why he has spared the invader instead of finishing him off, to which Nnoitra simply replies that he has no interest in finishing off weaklings. As the two begin to depart, Chad rises, gravely wounded and attempts one last attack on Nnoitra.
Tesla protects Nnoitra
However, he is stopped by Tesla using his sword. His reason for doing so was that he was concerned for Nnoitra and reasoned the enemy's last attack would be his strongest. Nnoitra scolds Tesla for interrupting, stating that no soul in the universe could harm him. Nnoitra then glances at Adella Garcia whom is beside Tesla and asks her if she would do such a thing, she says "No, Nnoitra-sama" with some hestitation, indicating a lie.
Tesla restrains Orihime.
After the conclusion of the fight between Ichigo Kurosaki and Grimmjow Jaegerjaquez, Nnoitra disposes of Grimmjow and takes over the fight. Nnoitra then instructs Tesla to restrain Orihime Inoue while he fights Ichigo. The fight ensues with Nnoitra dominating Ichigo until Nel Tu reveals herself and overwhelms Nnoitra. As Nnoitra is pressured by Nel, Tesla rushes to his side. However, he is scolded, thrown into a wall, and ordered to return to Orihime. Tesla then recaptures Orihime and kicks aside Ichigo, not allowing him to interfere with the fight of the two Arrancar as it is Nnoitra's personal right to destroy those that "block his blade."
Nnoitra and Nelliel fight until she reverts back into her child form. After becoming bored with Ichigo and Nel, Nnoitra commands Tesla to finish him off and force Orihime to watch him die. Tesla complies, releases his Zanpakutō, and mercilessly beats a weakened Ichigo. Tesla does this until being stopped at the last second by Kenpachi Zaraki.
Tesla is cut down by Kenpachi
Tesla questions who Kenpachi is and attacks him when his question is not answered. Adella Garcia runs into the battle, trying to protect Tesla, and instead, is cut vertically along-with Tesla.
Tesla sheds a tear for his fallen master
As Nnoitra is cut down, Adella Garcia screams out for him and yells harshly at Tesla to do something, but they are both too fatally wounded to prevent the attack.
After Nnoitra is killed by Kenpachi, he is seen dying on the ground in his unreleased state and sheds a single tear for his fallen master. Adella Garcia releases her Resurrección, thus allowing her to heal Tesla, but unfortunately, Nnoitra is dead, and therefore, she is unable to heal him. They both wonder what to do with themselves now that their master is dead.
Sometime after, they left Hueco Mundo, and went to King City to live "average lives", before becoming members of the organization, Venganza.