Imagine Agent Peggy Carter transformed into the superhero Captain Britain. She stands tall and proud in her Captain Britain costume, which features the iconic Union Jack flag motif as the dominant design element. The suit is a combination of red, white, and blue, with a British lion emblem on her chest. She wears a helmet that partially conceals her face but leaves enough room for her determined and confident expression to shine through. In one hand, she holds the legendary Amulet of Right, and in the other hand, she wields the mighty Star Sceptre, crackling with power. Behind her, a swirling vortex of mystical energy hints at her connection to otherworldly forces. The background could be a blend of modern and mythic elements, signifying her role as a protector of both realms.