In this footage of Kapil Dev's first over in Test cricket, you can see that he is quick. But he is being dispatched around the ground. He bowled a no-ball and gave away boundaries but it didn't take him long to became more menacing. In his second over, he bowled a bouncer to Sadiq Mohammed that climbed steeply and barely missed his cap. This forced Mohammed to signal the dressing room for a helmet, something that was unprecedented against Indian bowlers at that time.
Kapil Dev went on to being India's best all-rounder and the cricket reference book Wisden named him its Indian Cricketer of the Century. During his 16-year Test career, he took 434 wickets in 131 matches. He was also the first Indian captain to lead the team to a World Cup win in 1983.