A lengthy rain shower at Sahara Stadium Kingsmead delayed the start of the game and reduced its length by half, and when it finally got underway the Dolphins threw everything at their visitors.
The result was losing their opening batsmen with just nine runs on the board, before Jonathan Vandiar (33) and Vaughn van Jaarsveld (29) added 49 for the third wicket in 5.3 overs.
The partnership was broken by left-arm spinner George Linde, who went on to take 3 for 15 in his two overs as none of the other Dolphins batsmen reached double figures in a final total of 84 for eight.
The Dolphins needed Levi out early if they were going to defend it, but instead he smashed two sixes and seven fours in his 54, which took him just 27 balls.
When he departed to Dwayne Bravo the Cobras needed just 15 more runs in 17 deliveries, and had no problem in ticking them off.
The Cobras leapfrogged the Knights into second place as a result, and moved to within three points of the Lions thanks to their defeat by the Titans.
Michael Owen Smith