Red Bloon Apopalypse is a Basic Powercard in Bloons Card Storm, introduced in version 3.0. It is similar to Red Bloon Storm, except it fills all empty slots in both the player's and the opponent's Bloon queues with Red Bloons instead of just the player's. Red Bloons fill one at a time at the player's side, and then again for the opponent's side.
Unlike the more common and cheaper Red Bloon Storm, Red Bloon Apopalypse is a bit of a double-edged sword. Both players simultaneously have all Red Bloons and cannot play any more of their own Bloons until at least some of the Bloons are popped. Fortunately, the opponent's Reds will not be a threat until your next two turns, and your Reds will come first.
Like going against Red Bloon Storm, Spike Storm! is a cost-effective choice to weaken or eliminate the opponent's Red Bloons.
Avoiding popping the Bloons spawned on the opponent's side has many practical benefits:
It prevents the opponent from playing any of their own Bloons for two turns, which gives more tempo for the user and stops aggro players (unless it's a swarm aggro deck that uses Bloon Embiggen, which benefits them instead). This can be combined with Glue Storm and/or Powerful Slowing Totem to add more turns.
It can block the Storm from summoning more Bloons.
Weakening the opponent's Bloons without popping them (such as by using one Spike Storm), then allowing them to leak, is an easy way to scale Heart of Vengeance Druids.
Red Bloon Apopalypse may also reduce chances for a successful Hastening Bloon on either side if the Reds are not 0 delay.
Note that a player can use Quincy's Arrow Shot or certain cards (e.g. Overload, Bloon Melter, Enhanced Reflexes) to open up space for another Bloon. Both players are able to take advantage of this to send better bloons for extra pressure.
Spike-o-Pults can pop the opponent's Bloons to gain more Attack Power easily. Note that popping one of the opponent's Bloons right before the Storm summons a Bloon on their side will cause the Storm to fill the empty slot before the opponent can play their own Bloons, which allows the player to scale a Spike-o-Pult while still preventing the opponent from playing their own Bloons.
Once the opponent's Red Bloons are destroyed, they fill the opponent's graveyard with Red Bloons, which makes Reinflated and The Prestige less likely to draw the Bloons the opponent wants (usually The Eternal).
Some decks that focus on the Extractor Bloon utilize Red Bloon Apopalypse with weak damage like Quincy's passive, Spike Storm, or Glaive Ricochet to feed the Extractor Bloon(s).