|Air date||June 15, 2018|
After Lotor and Allura head off in the new ship, the remaining Paladins get a dire warning that could change everything.
The Sincline ships are finally completed. As the rest watch from the Castle of Lions, Allura and Lotor enter the quintessence field and are hailed by an unidentified craft. Coran determines that the craft is Altean in origin.
When Allura and Lotor return, they kiss but soon after that Allura find out about his true colors. Keith and Krolia arrive with the Altean they discovered and reveal that Lotor has been lying to them the entire time. The Altean, Romelle reveals that Lotor rescued the Alteans who had been off-world at the time of Altea's destruction and created a colony for them to hide in peace. However, Lotor created a second colony where he sent Alteans and harvested quintessence from them.
Allura knocks out Lotor, overwhelmed by his betrayal although he begs for her to listen to him. Honerva then activates Shiro. Under Honerva's command, Shiro abducts the unconscious Lotor and Pidge is unable to stop him. Keith takes back control of the Black Lion and the Paladins head off in pursuit.
"It's a moment I will truly never forget."
"Wait, how do we know you're the real Keith and not his bigger, cooler, grizzled older brother?"
"I don't have time for this, Lance!"
"...Hey, everybody, Keith's back!"
— Lance tries to insult Keith, some things never change
- Unlike their Defender of the Universe incarnations, this Romelle and Bandor are not related to Allura, nor do they appear to hold the rank of royalty.