How has Imran Khan influenced Pakistan democracy?

Is the military controlling Pakistan? Why is Imran Khan under scanner?

Background

Imran Khan was extremely popular during his career as a cricketer. He is also now widely recognized as one of the top politicians in Pakistan. The gun attack that injured Imran Khan have created a lot of sympathy and has also added to his popularity. But it is important to note that it could also derail his campaign for future elections. He might not be able to lead rallies because he's injured. And in his absence, the Pakistan Tehreek-e-Insaf (PTI; Urdu: پاکستان تحريکِ انصاف, lit. 'Pakistan Movement for Justice') might not be able to attract a lot of large crowd of people. It was an extremely lucky situation that Pakistan was able to avoid another assassination in its soil.