The mighty Subjugator-class heavy cruiser Malevolence is en route to destroy a fleet of evil Venator-class Star Destroyers in the Ryndellia system. The mission is interrupted by someone onboard the Subjugator cruiser. That someone is Indigo Zap, but she's not alone–Starlight Glimmer, hoping to boost the reputation of Our Town, has joined her in sabotaging the ship. Once Grievous realizes that the Malevolence is set on a collision course to the Dead Moon of Antar, Grievous tries to change the hyperdrive…but it may already be too late…

Timelines:
Star Wars: The Clone Wars: After "Rising Malevolence", right before the first spacebattle in "Shadow of Malevolence".
MLP: Right before the Mane 6 discover Our Town.
EQG: Right before the Friendship Games.