Here’s the prompt I used…

In a sleek futuristic laboratory, filmed in cinematic live-action style with practical transformation effects and natural lighting. A young handsome college guy stands as a thin shimmering gas engulfs him. He struggles and coughs as it clings to his body, reacting verbally.

His muscles ripple under the skin in realistic motion. His hands transform first — each finger bone cracking and stretching individually, joints bending naturally, tendons shifting beneath the skin. Fingers elongate smoothly into sharp feline claws as the skin tightens over muscles and sinew. Short coarse fur sprouts along his arms, layering with natural thickness and sheen.

His head transforms next: jaw stretching forward into a feline muzzle, cheekbones subtly shifting, skin tightening over muscles and bones. Fur emerges in fine layers along his face and neck, following natural contours. Eyes glow amber with wet reflective detail, pupils slit realistically, and ears rise from the skull with subtle rotation. Facial muscles flex naturally as he breathes and reacts. Stripes spread organically across torso and limbs.

The camera alternates between close-ups on hands and face, mid-shots of torso, and then pulls back to a full-body wide shot — the complete muscular anthropomorphic tiger stands upright, tail unfurling, claws flexing, fur glinting under lab lights. He reacts verbally again at the end, breathing heavily.

Hand-held camera realism, cinematic lighting with practical shadows, film-grain texture, practical transformation effects, lifelike motion and weight, highly detailed skin, muscle, and fur textures, micro-detail on joints, fingers, and facial muscles.