DC Explosion and DC Implosion

The "DC Explosion" and "DC Implosion" were two events in 1978 – the first an official marketing campaign, the second a sardonic reference to it – in which American comics company DC Comics expanded their roster of publications, then abruptly cut it back. The DC Explosion was part of an ongoing initiative at DC to regain market share by increasing the number of titles they published, while also increasing page counts and cover prices.

Source: Wikipedia — DC Explosion and DC Implosion (CC BY-SA 4.0)