: Vrak reveals he has been holding Robo Knight captive and has reprogrammed him into Dark Robo Knight.
In Episode 16, " Vrak is Back (1) " , the stakes reach a boiling point as one of the series' most calculated villains returns to reclaim his birthright after the demise of his brother, Prince Vekar . The Master Plan: Earth on the Brink [S21E16] Vrak is Back (1)
: He abducts the Silver Ranger , Orion, and begins draining his alien life force to power his Gosei Orbs and disable the Rangers' Legendary powers . : Vrak reveals he has been holding Robo
: By draining Orion, Vrak turns the Rangers’ Legendary Keys to stone and disables their Super Mega Mode . This forces the team to revert to their original Megaforce forms and arsenal, including the Gosei Great Megazord . Dark Robo Knight Returns : By draining Orion, Vrak turns the Rangers’
The most emotional blow for the team is the return of Robo Knight , who has been MIA since the Megaforce finale.
Vrak isn't just back for revenge; he’s back to finish what he started with a multi-layered plan to literally tear the Earth apart:
In a classic Vrak move, he tricks the Rangers into doing his dirty work. He sends his henchman, , to fight the Rangers. When the Rangers use their Sea Brothers power to destroy him, Vrak reveals that Tresnag was a "cipher" designed to absorb their attack energy. That very energy is what powers the second giant drill, leaving the Rangers in a state of despair as they realize they’ve helped Vrak get one step closer to checkmate .