Batgirl and little Alex sat on a checkered picnic blanket, enjoying the warmth of the day. Alex's laughter filled the air as he reached for another sandwich. The sky was a clear blue, and a gentle breeze rustled the leaves above them. "I love these sandwiches, Batgirl!" exclaimed Alex, his eyes sparkling with joy.

Alex's expression changed abruptly, his hand clutching his throat. Panic seized Batgirl as she realized the severity of the situation. She quickly scooped Alex into her arms, her heart pounding. "Hang on, Alex, I've got you," she reassured him, her voice steady despite the urgency.

Batgirl placed Alex gently on the sofa and dashed to the kitchen. Her eyes scanned the counter for anything amiss. The realization hit her like a bolt of lightning when she spotted the peanut butter jar, its lid ajar. "The Joker," she muttered, her eyes narrowing. She knew he must have swapped the sandwiches, a sinister grin undoubtedly playing on his lips as he did so.

Batgirl stood on the rooftop, the cool night breeze ruffling her cape. Batman, Catwoman, and Harley Quinn joined her, their faces set with determination. "We'll get him," Batman assured her, his voice a deep rumble. "No one messes with our family," Catwoman added, her eyes glinting with resolve.

The four heroes moved stealthily through the dimly lit warehouse, their senses alert. The Joker's maniacal laughter pierced the silence, his silhouette flickering in the distance. "Time to end this charade," Harley Quinn declared, twirling her mallet with a flourish.

Batman analyzed the situation, his analytical mind piecing together the events. Alex lay resting, his breaths now steady and calm. "He'll be fine as long as he avoids peanuts," Batman concluded, offering Batgirl a reassuring nod. "I promise to be more careful next time," Batgirl vowed, relief washing over her as she watched Alex stir slightly, a smile forming on his lips.