How many aliens forms can take Ben 10?

Ben Tennyson, the protagonist of the "Ben 10" franchise, can transform into a variety of alien forms using the Omnitrix. As of the latest series, "Ben 10 (2016)," he has access to over 70 different aliens. Each alien has unique abilities and traits, allowing Ben to adapt to various challenges. The exact number may vary with different iterations of the series and new content introduced.