After Orion and Megatron join forces, he participated in the attack on the Citadel.

Entity and relation annotations:
id: 0
type: entity
value: text: Orion
labels: <Person>
id: 1
type: entity
value: text: Megatron
labels: <Person>
id: 2
type: entity
value: text: the Citadel
labels: <Location>
type: relation
to_id: 1
labels: Person:business/work:Person
from_id: 0