Spike Rush was a limited-time mode, available in the '80s Culture phase of the Radical Summer event.
On December 2, 2019 it was announced that Spike Rush would make a return for a limited time, Starting on December 4, 2019.
On March 30, 2020 it was announced that Spike Rush would make a return for a limited time, starting on April 2, 2020.
"All players have spikes which automatically engage after kickoff, allowing them to stick the ball to their car by driving into it. The ball carrier cannot use or collect boosts, is easily demolished by opposing players, and can manually disengage their car's spikes to release the ball. Score by getting the ball into your opponent's goal by any means."
Anyone who logged into Rocket League while Spike Rush was live (April 2 - 6) got the Picnic Player Banner for free!