Is this Pre-Crisis Composite Superman?
Because if it is then I don’t see the team winning.
In terms of abilities and raw power, the Composite Superman was one of the most powerful enemies Superman and Batman ever faced. In addition to all of Superman's powers (derived from Supergirl), the Composite Superman's strength and invulnerability levels were three times as powerful as Superman's because Legionnaires Mon-El and Ultra Boy were invulnerable and possessed super-strength. The Composite Superman also possessed numerous special powers, derived from various Legion members:
* The ability to grow to giant size (Colossal Boy)
* The ability to shrink (Shrinking Violet)
* The ability to divide into 3 people (Triplicate Girl)
* The ability to fire lightning bolts (Lightning Lad)
* The ability to generate heat and light (Sun Boy)
* The ability to make things super-lightweight (Light Lass)
* The ability to make things super-heavy (Star Boy)
* The ability to eat any form of matter (Matter-Eater Lad)
* The ability to turn invisible (Invisible Kid)
* The ability to inflate into a large ball (Bouncing Boy)
* The ability to stretch any part of his body (Elastic Lad)
* The ability to shapeshift (Chameleon Boy)
* Telepathy (Saturn Girl)
* 12th level intelligence (Brainiac 5)
* Magnetic powers (Cosmic Boy)
* X-ray vision that could see through anything, even lead (Ultra Boy)
* The ability to transmute elements (Element Lad)
* The ability to phase through solid matter (Phantom Girl)
* The ability to reduce the heat around himself or other objects (Polar Boy )
* master of every form of martial arts to have been developed up to the 30th century(Karate Kid)
* possesses the superhuman ability to generate illusions(Sensor Girl)
From Wikipedia.