Entrapta was first seen in season 1 episode 6, system failure, where Adora, Glimmer and Bow trek to Dryl to recruit Entrapta for Glimmer's new princess alliance. but when they get there they realise that a piece of first ones tech that entrapta was studying suddenly corrupted all the robots in dryl and everyone works together to save dryl and free the robots of the corruption.

The next most important event in her story is the rescue of Princess Glimmer and Bo after they got kidnapped by the horde after the mission at the princess ball to recruit princess Frosta for the princess alliance. As the princess alliance is making it's way through the FrightZone, Entrapta gets too distracted by the technology bulding up The Horde's home and seperates from Perfuma who she was meant to stay with. A bit of time later she reunites with Seahawk riding on her reprogrammed Horde Bots named E.M.I.L.Y and then the rest of the Princess Alliance and frees Bo and Glimmer. But when there about escape E.M.I.L.Y gets caught on a wire and entrapta tried to untangle it but the door closed and fire noises can be heard and...

jk
she actually lived and was living in the air vents of the Fright Zone. Until Catra found her after she was moving from air vent, Catra lied to her saying they left her behind and getting her to work on projects in the Fright Zone. here experiment was repowering the black garnet (scorpia's runestone) and transmitting the energy from it to power the all of the Fright Zone and putting all of etheria's nature going into completeby the powered up black garnet putting everything into an inbalanced state.
while living in the Fright Zone, Entrapta has found uncomplacent in here living conditions and her work effort has not been rewarded for making the newest models of horde bots. So she enters hordak's lab without knowing he was there, so when she stumbled upon him slouching under his work table out of this armor and his body is strangely deformed, trying to sneak away but instead tripped a wire and made many things fall until something big enough to catch Hordak's attention. And then that's when its revealed that Hordak is a failed clone of a galatic overlord.
HordePrime the true leader of the Horde, Hordak was a meant to be an ally of HordePrime, a Brother of his. but when being created there was a defect. And since HordePrime is hesitent on anything that isn't perfection,he sees them as something that shoudn't be in his image, in his brothership.so, he banished him sent to an alternate reality and Hordak formed the Horde in Etheria to regain his trust, to finally be seen as his brother. While in Etheria, he's been trying to create a new body to be acceptable to HordePrime.
feeling heart broken for Hordak she helps him create a new set of armour powered by a piece of first ones tech super charging it and giving hordak some insperational words.