In Disney's "Bolt", who is Bolt's chief companion, a sarcastic street cat?

Mittens

What classic strategy videogame has civilizations developing from the Stone Age to the Space Age? Which American BMX rider famously won medals at both Summer and Winter X Games? Which sport involves athletes pushing stones on ice toward a target? Which American activist became famous for improving working conditions for coal miners and child laborers in the early 1900s, earning the nickname 'Mother'? What is the first infinite cardinal number?